Michael V Kalaphates

Michael V Kalaphates (Ancient Greek: Μιχαήλ Καλαφάτης, Michaḗl Kalaphátēs) was Byzantine emperor for four months in 1041–1042. He was the nephew and successor of Michael IV and the adoptive son of Michael IV's wife Empress Zoe. He was popularly called "the Caulker" (Kalaphates) in accordance with his father's original occupation.

Source: Wikipedia — https://en.wikipedia.org/wiki/Michael_V_Kalaphates