In 170 BC, Antiochus IV began the sixth Syrian War and invaded Egypt twice. He was crowned as its king in 168, but 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, but 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.