Van Minderhout was born in
Antwerp and baptised on 29 August 1680. He was born as the son of
Hendrik van Minderhout and his father's second wife, Anna Victoria Claus. His father was a
Dutch-born
marine painter who was primarily active in the
Flemish cities
Bruges and Antwerp. Willem Augustin had an older brother,
Antoon, who was also a painter. Very little is known about Willem Augustin's training and early career. Unlike his brother, there is no record of him registering as a pupil or a master at the Antwerp
Guild of Saint Luke. He likely trained with his father and then worked in his father's workshop. He worked on the decoration of the palace halls in
Kroměříž Castle, the principal residence of the
bishops of Olomouc. At the time Cardinal Ferdinad Julius Troyer (1745–1758) was the resident bishop. He died in
Střílky, Moravia, on 31 May 1752. ==Work==