Ptolemy VI Philometor (Greek: Πτολεμαῖος Φιλομήτωρ, Ptolemaĩos Philomḗtōr, ca. 186–145 BC) was a king of Egypt from the Ptolemaic period. He reigned from 180 to 145 BC.
Ptolemy succeeded in 180 BC at the age of about 6 and ruled jointly with his mother, Cleopatra I, until her death in 176 BC, which is what 'Philometor', his epithet, implies; "he who loves his mother", φίλος (beloved,friend) + μήτηρ (mother). The following year he married his sister, Cleopatra II, as it was customary for Pharaohs, for the Ptolemaic Greek kings had adopted many customs of the Pharaohs.
In 170 BC, Antiochus IV began the sixth Syrian War and invaded Egypt twice. He was crowned as its king in 168. According to Livy’s The History of Rome from its Foundation (XLV.12), he abandoned his claim on the orders of the Roman Senate.
From 169–164, Egypt was ruled by a triumvirate consisting of Ptolemy, his sister-queen and his younger brother known as Ptolemy VIII Physcon. In 164 he was driven out by his brother and went to Rome to seek support, which he received from Cato. He was restored the following year by the intervention of the Alexandrians and ruled uneasily, cruelly suppressing frequent rebellions.
In 152 BC, he briefly ruled jointly with one of his sons, known as Ptolemy Eupator, but it is thought that Ptolemy Eupator died that same year.
In 145 BC he died of battle wounds received against Alexander Balas of Syria.