Thrasyllus of Mendes

Thrasyllus of Mendes (/θrəˈsɪləs/; Greek: Θράσυλλος Μενδήσιος), also known as Thrasyllus of Alexandria and by his Roman citizenship name Tiberius Claudius Thrasyllus ( Τιβέριος Κλαύδιος Θράσυλλος; fl. second half of the 1st century BC and first half of the 1st century – died 36,), was an Egyptian Greek grammarian and literary commentator. Thrasyllus was an astrologer and a personal friend of the Roman emperor Tiberius, as mentioned in the Annals by Tacitus and The Twelve Caesars by Suetonius.

Thrasyllus was an Egyptian of Greek descent from unknown origins, as his family and ancestors were contemporaries that lived under the rule of the Ptolemaic Kingdom. He originally was either from Mendes or Alexandria. Thrasyllus is often mentioned in various secondary sources as coming from Alexandria (as mentioned in the Oxford Classical Dictionary) as no primary source confirms his origins.

Thrasyllus encountered Tiberius during the period of Tiberius' voluntary exile on the Greek island of Rhodes, some time between 1 BC and 4 AD. Thrasyllus became the intimate and celebrated servant of Tiberius, and Tiberius developed an interest in Stoicism and Astrology from Thrasyllus.

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