In 1381 he married Françoise of Roussillon, daughter of count James of Roussillon and received as dowry several lands in the Bresse region of France.
Boniface held several military positions for the Counts of Savoy, including those of marshal of Savoy from 1384 to 1418, governor of Piedmont (since 1410), as well as that of Savoyan ambassador to France and other countries.
In 1407–1408, he perhaps visited the Saint Catherine's Monastery on Mount Sinai in Egypt.
His tomb was later transferred in 1798 by Philippe-Maurice de Challant in the Aymavilles Castle, to avoid vandalisms by the French revolutionary army.
It was eventually transferred in the Aosta Cathedral cloister in 1872.