 Until the reign of Ptolemy IV, the Ptolemies had controlled the region south of Aswan to the second cataract, which was known as the Triacontaschoenus or Lower Nubia and included rich gold mines.Throughout the 160s and 150s BC, Ptolemy VI reasserted Ptolemaic control over the northern part of Nubia.This achievement is heavily advertised at the Temple of Isis at Philae, which was granted the tax revenues of the Dodecaschoenus region in 157 BC.