The Chronicon Ambrosianum (Spanish: Cronicón ambrosiano) or Chronica parva Ambrosianum ("short Ambrosian chronicle") is a set of exceedingly terse medieval Latin annals that, together with the Annales Compostellani and the Chronicon Burgense, forms a group of related histories.
These were collectively labelled the Efemérides riojanas by Manuel Gómez-Moreno, who thought they had been compiled in La Rioja.
The Chronicon is named after the Biblioteca Ambrosiana in Milan, where its manuscript was discovered.
The Chronicon contains a list of ten feast days with the names of their saints and seventeen years, each described by one event.
The final year (Era 1208, that is, AD 1170), though it is placed out of chronological order, is the death of Thomas Becket.