Lammas ('loaf-mass') was an annual Catholic holiday, drawn from an older Pagan celebration, known to the Celts as Lughnassadh (Assembly of Lugh, pronounced 'Loo-nah-sah'), the feast of the lightning-god Lugh of the Long Hand (Llew to the Welsh). In ancient times, this was the feast of the corn-god, who represented the life force of the crops, who was slain at harvest time and dwelt in the underworld (often in the form of buried wine-jugs) until his rebirth at the winter solstice.

The holiday is celebrated by modern Pagans, often with bread and beer.