Pieter Brueghel (1525-69), usually known as Pieter Brueghel the Elder, to distinguish him from his elder son, was the first in a family of Flemish painters. You'll often find his name spelled as Bruegel (Pieter spelled it like that from 1559 onwards) or Breugel or Breughel.
He was born in Breda in the Duchy of Brabant, which is now part of The Netherlands but back then part of the Flanders.