High Quality Content by WIKIPEDIA articles! Old Kilcullen, formerly Kilcullen (Cill Chuilinn, "the Church of the Holly" in Irish), is a townland in County Kildare, Ireland, which includes a noted religious archaeological site within its boundary. It was formerly the site of a walled town, and before that of an ecclesiastical settlement dating from the 5th century. The original settlement gave its name to the substantial surrounding Civil Parish and barony.