Jesus Christ is risen today - tune; Llanfair
The lyrics came from "Lyra Davidica" ("The harp of David"), which was a collection of hymns, mostly translated from German or Latin, published in 1708 by John Walsh, John Hare and P. Randall, London publishers.
The tune - Llanfair - was composed by Robert Williams, who lived on the island of Anglesey, north Wales. He was blind, and worked as a basket maker. He also had a musical gift; it was said he only had to hear a tune once, and he could write it down. He was a popular singer, and wrote
many hymn tunes.
This hymn is sometimes confused with "Christ the Lord is risen today" and the tunes - Llanfair and Easter Morn - are interchangeable.
Both are available from The Sheet Music Stack, so feel free to mix and match.