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

Annibaldi

The Annibaldi are the pope's in-laws, a Roman house that will grow great in the thirteenth century on the Alban hills and in the Marittima.

On 1 January 1200 none of their later castles can be pinned to them; what is sure is the marriage tie to Innocent III and their place in the pope's party.

Who he is

Name
Annibaldo (the elder), married to a sister of Innocent III [date of the marriage and his standing on 1 January 1200 not pinned]
Title
Roman magnates, kin by marriage of the pope
Since
Not pinned
Born
Not pinned
Family
it.wikipedia makes the family kin by blood of Innocent III, Gregory IX and Alexander IV; Riccardo Annibaldi, the later cardinal (1237), was born about 1210
Confidence
low

it.wikipedia (Annibaldi): Annibaldo the elder married a sister of Innocent III and became senator (no date). The page's castles (Molara, Rocca Priora, Monte Porzio, Rocca di Papa, Monte Compatri, Sermoneta, Ninfa, Terracina, Genzano, Cori) are given without dates, and its tale of a dowry of 1090 is not reliable. The DBI on Riccardo Conti says the Conti held the lands between Circeo and Sora together with the Annibaldi, their kin by marriage (a later state of things).

Gregorovius: Pietro Annibaldi, a papal ally, built a tower near the Colosseum (in the troubles after 1203).

Overlord

The commune, and through it the pope.

What it holds

  • Houses in Rome near the Colosseum (the tower by the Colosseum is built after 1203)
  • Castles in the Alban hills and the Marittima: not pinned for 1200

Allies and rivals

Allies: the Conti. After 1202 they back one faction in Terracina against the Ceccano's.

How things stand that morning

In the pope's party; holdings not pinned.

Threats

  • The fall of the pope's party in Rome

Places of note

  • Annibaldi houses: By the Colosseum, where Pietro Annibaldi builds a tower after 1203

Where the sources disagree

Evidence: Only the marriage to the pope's sister is reasonably sure; nothing dates their castles to 1200.

On the map: No ground is drawn: their castles are later.

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. Annibaldi (it.wikipedia)
  2. Riccardo Conti (Treccani, Dizionario Biografico)
  3. F. Gregorovius, Storia della città di Roma nel medio evo, vol. 5

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