Chronicon Ambrosianum

The Chronicon Ambrosianum or Chronica parva Ambrosianum 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. It was first published by Ludovico Antonio Muratori.
The Chronicon contains a list of ten feast days with the names of their saints and seventeen years, each described by one event. The first event, in Era 38, is the nativity of Jesus. Besides deaths, the only events mentioned are the Massacre of the Innocents, the passion of Jesus, the assumption of John the Evangelist, and the prophesying of Mohammed. The final year, though it is placed out of chronological order, is the death of Thomas Becket. The last event in the list is the death of Juan de Ortega.

Editions

In Ludovico Antonio Muratori, ed. Rerum italicarum scriptores, II, col. 1024.
In Enrique Flórez, ed. España Sagrada,, 304–5.
In Miguel Bravo Tedín, ed. Efemérides riojanas. La Rioja: Editorial Canguro, 1992.