1160/66–1182/83) was an Italian writer and translator who served as a Latin–Greek interpreter in the imperial chancery of the Byzantine Empire under Emperor Manuel Komnenos.
Pascalis Romanus wrote his Liber thesauri occulti in 1165 based on the ancient Greek Oneirocritica and in 1169 made a translation of the Cyranides.
[1] In the latter half of the 1170s, Leo wrote a treatise on the heresies and prevarications of the Greeks, De haeresibus et praevaricationibus Graecorum, related in content to his brother's theological writings.
The first part, which details the errors of the Greek church, was used by the anonymous Dominican author of the Tractatus contra Graecos (1252).
There is no further information about Leo (who must have received the letter in early 1183) and it is unknown if he died in Constantinople or if he ever returned to Italy.