Hazel trees are common in England, and their sweet nuts become ripe in late summer. The feast day of a French saint named Philibert was also celebrated in late summer, at about the time people picked the ripe nuts. In Anglo-French, the form of French spoken in England after the Normans conquered it in 1066, the nut of the hazel tree was called "philber" after the saint. English speakers later respelled the word as "filbert." Nowadays, people are more apt to call the nuts "hazelnuts," but "filbert" is still a common name for the crunchy, sweet nuts.