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Catholic Encyclopedia
http://www.newadvent.org/cathen/09091a.htm
St. Laurence Giustiniani, or Lawrence Justinian, was a bishop and first Patriarch of Venice. He died in 1456.
For All the Saints
http://www.saintpatrickdc.org/ss/0905.htm#lawr
Fairly long biography of St. Laurence Giustiniani.