Mausoleum

Borrowed from Latin Mausōlēum, from Ancient Greek Μαυσωλεῖον (Mausōleîon), from Μαύσωλος (Maúsōlos, “Mausolus”) +‎ -εῖον (-eîon, noun-forming suffix meaning “place or building associated with a specific purpose or person”).

By surface analysis, Mausolus +‎ -eum.