Ptolemy V Epiphanes Eucharistos was the King of Ptolemaic Egypt from July or August 204 BC until his death in 180 BC.
Ptolemy V, the son of Ptolemy IV and Arsinoe III, inherited the throne at the age of five when his parents died in suspicious circumstances. The new regent, Agathocles, was widely reviled and was toppled by a revolution in 202 BC, but the series of regents who followed proved incompetent and the kingdom was paralysed. The Seleucid king Antiochus III and the Antigonid king Philip V took advantage of the kingdom's weakness to begin the Fifth Syrian War, in which the Ptolemies lost all their territories in Asia Minor and the Levant, as well as most of their influence in the Aegean Sea. Simultaneously, Ptolemy V faced a widespread Egyptian revolt led by the self-proclaimed pharaohs Horwennefer and Ankhwennefer, which resulted in the loss of most of Upper Egypt and parts of Lower Egypt as well.
Ptolemy V came of age in 196 BC and was crowned as pharaoh in Memphis, an occasion commemorated by the creation of the Rosetta Stone. After this, he made peace with Antiochus III and married his daughter Cleopatra I in 194/3 BC.