General deities were known by the Celts throughout large regions, and are the gods and goddesses called upon for protection, healing, luck, and honour.
After Celtic lands became Christianised, there were attempts by Christian writers to euhemerize or even demonize most of the pre-Christian deities, while a few others became Saints in the church.
The Tuatha Dé Danann of Irish mythology, who were commonly interpreted as divinities or deified ancestors, were downgraded in Christian writings to, at best "fallen angels", or mere mortals, or even portrayed as demons.
The Gauls inhabited the region corresponding to modern-day France, Belgium, Switzerland, southern and western Germany, Luxembourg and northern Italy.
The Brythonic peoples, descendants of the Celtic Britons, inhabited western Britain (mainly Scotland Strathclyde, Wales, Cumbria and Cornwall) and Brittany.