High Quality Content by WIKIPEDIA articles! Nidan (sometimes known as Midan or Idan) was a Welsh priest (and, according to some sources, a bishop) in the 6th and 7th centuries who is commemorated as a saint. He was the confessor for the monastery headed by St Seiriol at Penmon and established a church at what is now known as Llanidan (which are both places on the Welsh island of Anglesey). He is the patron saint of two churches in Anglesey: St Nidan`s Church, Llanidan, built in the 19th century, and its medieval predecessor, the Old Church of St Nidan, Llanidan. Midmar Old Kirk in Aberdeenshire, Scotland, is also dedicated to him: Nidan is said to have helped to establish Christianity in that area as a companion of St Kentigern. St Nidan`s, Llanidan, has a reliquary dating from the 14th or 16th century, which is said to house his relics.