Magnates and their honours · Commune of Rome · as at first light, 1 January 1200

Pierleoni

The Pierleoni were the richest house of twelfth-century Rome and gave the Church an antipope.

In 1200 they are the old money of the communal party: Giovanni Pierleone, a former senator, wants the senate free of the pope. He is out of office and quiet that winter, but he and Giovanni Capocci will lead the revolt of 1203-1204.

Who he is

Name
Giovanni Pierleone (Iohannes Petri Leonis), former senator
Title
Roman magnates; leaders, with the Capocci, of the party of an independent senate
Since
Senator in the 1190s, after Benedetto Carushomo's fall (1193)
Born
Not pinned
Family
The house of Pierleone, converted Jewish bankers of the eleventh century, kin of the antipope Anacletus II (1130-1138); a Gregorio Pierleone is senator in the troubles of 1203-1205 (Gregorovius)
Confidence
medium

Gregorovius and Luchaire: Giovanni Pierleone and Giovanni Capocci were senators after Carushomo's sole senatorship (1191-1193) and lead the party of municipal independence; in 1203-1204 they head the revolt against the pope's senate. Their twelfth-century fortress by the theatre of Marcellus and San Nicola in Carcere is standard in the histories of the city; their holdings outside Rome in 1200 are not pinned.

Overlord

The commune, and through it the pope.

What it holds

  • Towers and houses by the theatre of Marcellus and San Nicola in Carcere, near the Tiber island (twelfth-century seat)
  • Castles outside Rome: not pinned

How it was acquired

Banking wealth of the eleventh century.

Allies and rivals

Allies: the Capocci and the communal party. Rivals: the pope's senators and kin; of old, the Frangipani.

How things stand that morning

Out of power; no open action recorded that winter.

Wealth

Roman property and old banking wealth.

Military

Their towers and armed followers; no numbers.

Threats

  • The pope's control of the senate

What the year holds

What happened next, if nothing in play changes it. Each event carries what it depends on and what would stop it.

  1. 1203-1204 (beyond 1200)With Giovanni Capocci, leads the rising for an independent senate against the pope's men (Riccardo Conti, Pandolfo della Suburra).Depends on: The Poli affair and the Orsini feud inflaming the city. Stopped by: The pope's concessions or a strong papal senator.

Places of note

  • Theatre of Marcellus: Twelfth-century Pierleoni fortress

Where the sources disagree

Evidence: Named as a former senator and party leader in Gregorovius and Luchaire; their property in 1200 is not documented in the sources checked.

On the map: An urban family: shown as a point in Rome.

Primary sources for Rome

Chronicles, registers, sagas and inscriptions written in or near 1200 that cover this entry. Each has its own page with editions, translations and where to read it.

Sources and studies

  1. F. Gregorovius, Storia della città di Roma nel medio evo, vol. 5
  2. A. Luchaire, Innocent III: Rome et l'Italie (PDF)

Last revised 4 November 2026. Published 4 November 2026. Suggest a correction on the OMNIA Discord.