The Seven Deadlies were originated by Pope St. Gregory the Great. The following are Roman Catholic web pages regarding him: http://www.monksofadoration.org/gregory.html http://christdesert.org/noframes/scholar/benedict/st.gregory.html
(This is a quote from a Catholic regarding their origin) He apparently was familiar with an early list made by St. John Cassian, both men had been thinking about the basic attitudes behind sin.
(Another quote from a Catholic) The list does not exist in Scripture as such, but all seven are proscribed throughout, especially in the Epistles of St. Paul and James.