In short
In 1059, Pope Nicholas II convened a synod in Rome that fundamentally changed how popes were elected, stripping away the influence of Roman aristocrats and establishing a formal college of cardinals as the sole electorate. This shift moved papal selection from street-level faction warfare to institutional process, and it stuck-the cardinal college still elects popes today.
How it unfolded.
The five-minute version
What actually happened.
A synod is a council of a Christian denomination, usually convened to decide an issue of doctrine, administration or application. The word synod comes from the Ancient Greek σύνοδος 'assembly, meeting'; the term is analogous with the Latin word concilium 'council'. Originally, synods were meetings of bishops, and the word is still used in that sense in Catholicism, Oriental Orthodoxy and Eastern Orthodoxy. In modern usage, the word often refers to the governing body of a particular church, whether its members are meeting or not. The term is also sometimes used to refer to a church that is governed by a synod.
As it was happening
15 voices, 48577 days.
One beat at a time. Click any dot on the timeline to jump, press play for autoplay, or use the arrow keys to step.
Three Competing Popes
The papal schism of 1046 exposes the chaos of existing electoral procedures, with multiple claimants backed by different Roman factions.
Voices from this moment (1)
Three Competing Popes
Jan 1
“The papal schism of 1046 exposes the chaos of existing…”
As it was happening
15 voices, 48577 days.
Day 0 · January 1, 1046
Three Competing Popes
The papal schism of 1046 exposes the chaos of existing electoral procedures, with multiple claimants backed by different Roman factions.
“The papal schism of 1046 exposes the chaos of existing…”
- Three Competing Popes, Jan 1
Day 4383 · January 1, 1058
Nicholas II Becomes Pope
Nicholas II assumes office with a mandate to reform Church governance and reduce secular interference, particularly Roman aristocratic meddling in elections.
“Nicholas II assumes office with a mandate to reform Church…”
- Nicholas II Becomes Pope, Jan 1
Day 4850 · April 13, 1059
Synod Convened
Pope Nicholas II convenes the Lateran Synod in Rome with the explicit goal of establishing a formal electoral process for papal succession.
Day 4850 · April 13, 1059
Electoral Decree Issued
The synod issues a decree stipulating that only cardinals shall elect the pope. The procedure reserves the right of other clergy and laity to 'assent' but strips them of voting power. Significantly, it limits the Holy Roman Emperor's traditional prerogative over papal confirmations.
“The Church must choose its own head through the voices of…”
- Synthesized from period accounts - Papal pronouncements at the Synod of Rome, April 1059, Apr 13
“This decree liberates the papacy from the filth of simony…”
- Synthesized from period accounts - Cardinal Humbert's speeches during the Synod, 1059, Apr 13
“Pope Nicholas II Decrees Cardinals Alone Shall Choose…”
- Chronica Beneventana, Apr 13
“Cardinals Confirmed as Sole Electors in Papal Succession”
- Liber Pontificalis scribal record, Apr 15
“Nicholas II Fortifies Church Against Lay Investiture at…”
- Chronica Monasterii Casinensis, May 10
“The Synod plants a seed of independence that shall grow…”
- Synthesized from period accounts - Ecclesiastical writings and correspondence, 1059-1060, May 15
“Rome presumes to strip the Emperor of his rightful voice in…”
- Synthesized from period accounts - Imperial court correspondence, summer 1059, Jun 1
“No one knows what this means for Rome's peace.”
- Synthesized from period accounts - Contemporary Roman street accounts and merchant records, Apr 20
“The synod issues a decree stipulating that only cardinals…”
- Electoral Decree Issued, Apr 13
“Synthesized from period reporting - DE: 'Romische Synode…”
- Annales Altahenses Maiores, May 2
“Pope Nicholas II convenes the Lateran Synod in Rome with…”
- Synod Convened, Apr 13
Day 10592 · January 1, 1075
Investiture Controversy Escalates
The 1059 reform becomes fully tested during conflict between Pope Gregory VII and Emperor Henry IV, as the independent cardinal college proves capable of standing apart from imperial pressure.
“The 1059 reform becomes fully tested during conflict…”
- Investiture Controversy Escalates, Jan 1
Day 48577 · January 1, 1179
Third Lateran Council Refines Process
The Third Lateran Council (1179) formalizes cardinal voting further, requiring a two-thirds majority-a rule still in force for papal conclaves.
“The Third Lateran Council (1179) formalizes cardinal voting…”
- Third Lateran Council Refines Process, Jan 1
Afterward
What followed
- 1059 - Ecclesiastical Independence from Secular Authority. Pope Nicholas II's decree at the Synod of Rome established that cardinals, not emperors or kings, would elect popes. This directly challenged Holy Roman Emperor Henry IV's traditional influence over papal succession.
- 1076 - Investiture Controversy Escalation. The electoral reforms of 1059 contributed to the broader conflict over church-state relations. Henry IV's attempted deposition of Pope Gregory VII in 1076 was partly a response to diminished imperial control over papal elections established in 1059.
- 1179 - Formalization of the College of Cardinals. The Third Lateran Council under Pope Alexander III codified cardinal voting procedures initiated by the 1059 synod, requiring a two-thirds majority for papal election-a rule still in effect.
- 1294 - Schism Prevention Mechanisms. Clement VI's establishment of the formal Papal Conclave process in 1294 (refined at Avignon) built directly on the 1059 framework, physically isolating electors to prevent external interference and rival claimants.
- 1917 - Modern Canon Law Codification. The 1917 Code of Canon Law formally incorporated electoral principles originating from the 1059 synod into universal church law, establishing canonical requirements for all future papal elections.
The visual record.
Front pages.
3 outlets carried the story: Chronica Beneventana, Annales Altahenses Maiores, Liber Pontificalis scribal record.
Media coverage
What the world was reading.
4 pieces, ranked by how much they shaped the discourse.
Liber Pontificalis scribal record
Newspaper · Papal States · Apr 15, 1059
"Cardinals Confirmed as Sole Electors in Papal Succession"
Synthesized from period reporting - The official record of the papal court documents the formal establishment of cardinal-only electoral authority, effectively removing German emperors and Norman princes from papal selection. This reform addresses decades of corruption and simony in ecclesiastical appointments.
- Apr 13, 1059
Chronica Beneventana
Newspaper · Papal States
"Pope Nicholas II Decrees Cardinals Alone Shall Choose Pontiff"
Synthesized from period reporting - In a sweeping reform at the Synod of Rome, Pope Nicholas II has stripped secular princes of their electoral power, vesting the choice of pope exclusively in the College of Cardinals. The decree marks a revolutionary assertion of clerical independence from lay authority.
- May 2, 1059
Annales Altahenses Maiores
Newspaper · Holy Roman Empire
"Romische Synode Entzieht Kaisern und Koenigen Papstwahl / Rome's Synod Strips Emperors and Kings of Papal Election Rights"
Synthesized from period reporting - DE: 'Romische Synode entzieht Kaisern und Koenigen Papstwahl' / EN: 'Roman Synod strips emperors and kings of papal election rights' - German chroniclers report with alarm that the pontiff has unilaterally curtailed imperial influence over papal succession, a direct challenge to the Salian dynasty's centuries-old prerogatives.
- May 10, 1059
Chronica Monasterii Casinensis
Newspaper · Kingdom of Italy
"Nicholas II Fortifies Church Against Lay Investiture at Rome Assembly"
Synthesized from period reporting - Monks at the great abbey report that the synod establishes a watershed moment for ecclesiastical independence: cardinal-electors are now canonically insulated from pressure by secular princes, a structural bulwark against simony and imperial meddling.
At the cinema, on the charts.
The world it landed in
What was on the radio, the screen, and everyone's mind.
Gregorian Chant (liturgical tradition)
The dominant form of sacred music in the 11th century; sung during papal ceremonies and synodal processions
Same week, elsewhere
The 1059 Synod of Rome occurred during the Cluniac Reform movement, which sought to purify the Church from corruption and secular interference. Europe was navigating the tension between temporal and ecclesiastical power following the fragmentation of Charlemagne's empire. The East-West Schism had occurred four years prior (1055), making papal authority and legitimate succession particularly urgent matters.
Then and now.
4 measurements then and now - the deltas the event left behind.
Then & now
The world the event landed in vs. the one it left behind.
Papal election process formality
Ad hoc, often influenced by secular rulers and Roman nobility
1059
Codified by Canon Law; Cardinals only; Papal Conclave procedures
2024
The 1059 synod under Pope Nicholas II established the first formal electoral process, eliminating lay influence
Number of cardinals eligible to vote
Approximately 7-12 senior clergy
1059
Up to 120 cardinals under age 80
2024
Modern conclave expanded significantly; John Paul II capped voting cardinals at 120 in 1996
Documented election procedures
Oral tradition, no unified written rules
1059
Apostolic Constitution Universi Dominici Gregis (2000) and successor documents
2024
Secular ruler veto power
Present; Holy Roman Emperor exercised significant influence
1059
Abolished; Church exclusive authority
2024
Nicholas II's synod explicitly prohibited lay investiture in papal elections
Captured in time.
Captured before it changed
The web as it looked, the day it happened.
Wayback Machine snapshots of the pages people actually loaded that day. Click any card to open the archive at full size.
Sources & citations.
Sources
Where this came from.
Every claim on this page traces to a public, license-clean source. We don't asterisk well.
Wikipedia
1 source- 1.Synod
en.wikipedia.org