Ptolemy IV Philopator
Thalamegos ( = "room carrier" from the Greek Thalamos (room) + Ago (haul/carry/lead) was a , high, two-story Nile river palace barge. The huge twin-hulled catamaran was commissioned by Hellenistic king Ptolemy IV Philopator for himself and his wife Arsinoe III "ca." 200 BCE.