
The Catalan Company or the Great Catalan Company was a company of mercenaries led by Roger de Flor in the early 14th century and hired by the Byzantine Emperor Andronikos II Palaiologos to combat the increasing power of the Anatolian beyliks. It was formed by almogavar veterans of the War of the Sicilian Vespers, who had remained unemployed after the signing in 1302 of the Peace of Caltabellotta between the Crown of Aragon and the French dynasty of the Angevins.

The Battle of Halmyros, known by earlier scholars as the Battle of the Cephissus or Battle of Orchomenos, was fought on 15 March 1311, between the forces of the Frankish Duchy of Athens and its vassals under Walter of Brienne against the mercenaries of the Catalan Company, resulting in a decisive victory for the Catalans.

Bernat de Rocafort was the third leader of the Catalan Company, from 1307 until 1309.

In 1303, the Byzantine Emperor Andronicus II Palaeologus hired 6,500 Catalan mercenaries under Roger de Flor to campaign against the Turks in the spring and summer of the same year. Their costly service came with success, driving back the Turks in parts of Asia Minor. At Philadelphia, 18,000 Turkish soldiers were left dead, the work of the Catalans.

The Chronicle of Ramon Muntaner, written in Xirivella between 1325 and 1328, is the longest of the four great chronicles and narrates the facts from the birth of James I of Aragon (1207) to the coronation of Alfonso IV of Aragon (1328). His character of "mirror of princes" and "mirror of citizens" has been pointed out by all scholars.

Roger de Flor, also known as Ruggero/Ruggiero da Fiore or Rutger von Blum or Ruggero Flores, was an Italian military adventurer and condottiere active in Aragonese Sicily, Italy, and the Byzantine Empire. He was the commander of the Great Catalan Company and held the title Count of Malta.

Ramon Muntaner was a Catalan mercenary and writer who wrote the Crònica, a chronicle of his life, including his adventures as a commander in the Catalan Company. He was born at Perelada.