Pange Lingua Gloriosi - Article in the Catholic Encyclopedia on the two hymns of this name. The second is by Thomas Aquinas. The first is "generally credited" to Venantius Fortunatus, though some believe it is the work of Claudianus Mamertus. - http://www.newadvent.org/cathen/11441c.htm
Venantius Honorius Clementianus Fortunatus - Short biography. English translations of five hymns, with MIDI files. - http://www.cyberhymnal.org/bio/f/o/fortunatus_vhc.htm
Fortunatus - Lengthy biographical article on the talented sixth-century poet and hymn-writer. In the Catholic Encyclopedia. - http://www.newadvent.org/cathen/06149a.htm
Venantius Fortunatus, Saint - Brief biographical entry in the Columbia Encyclopedia. - http://www.bartleby.com/65/ve/Venantiu.html