March 18, 1123

The First Lateran Council, considered the ninth ecumenical council by the Roman Catholic Church, opened in the Lateran Palace in Rome. It aimed to address issues relating to church reform and the resolution of conflicts that arose from the Investiture Controversy.


Rome, Italy | Roman Catholic Church

Watercolor painting based depiction of The First Lateran Council, considered the ninth ecumenical council by the Roman Catholic Church, opened in the Lateran Palace in Rome. It aimed to address issues relating to church reform and the resolution of conflicts that arose from the Investiture Controversy. (1123)

The First Lateran Council

The First Lateran Council, deemed the ninth ecumenical council by the Roman Catholic Church, commenced on March 18, 1123. Held in the Lateran Palace in Rome, this significant ecclesiastical assembly aimed to address pressing issues of church reform and resolve the ongoing tensions from the Investiture Controversy.

Context and Background

  • Investiture Controversy: This conflict primarily revolved around the power struggle between the papacy and secular European monarchs over the appointment of bishops and abbots. It highlighted the broader struggle between church authority and royal sovereignty during the Middle Ages.

  • Concordat of Worms (1122): A precursor to this council, the Concordat of Worms marked an attempted resolution to the Investiture Controversy. It established a distinction between the spiritual and temporal responsibilities of bishops, allowing the pope to invest bishops with spiritual authority while acknowledging the king’s role in bestowing temporal power.

Key Issues Addressed

  • Church Reform: The council focused on enforcing canonical regulations, strengthening clerical discipline, and addressing issues of simony (the buying or selling of ecclesiastical privileges) and clerical marriage, which were prevalent concerns of the time.

  • Confirmation of the Concordat of Worms: The agreements reached in the Concordat of Worms were affirmed, which intended to delineate the boundary between secular and ecclesiastical authority.

  • Canonical Legislation: The council enacted numerous canons that codified reforms and set precedents for church governance and doctrine, influencing church policy for years to come.

Historical Significance

The First Lateran Council was significant as it was the first council convened after the resolution of the Investiture Controversy to formally approve the Concordat of Worms. It reinforced papal authority, setting a precedent for the autonomy of the church from secular rulers and contributing to the strengthening of the papacy during the High Middle Ages.

The reforms enacted during this council laid foundational principles that affected subsequent church policies and were pivotal in shaping the Catholic Church’s structure and influence in Europe.