It is proposed to rename the page to Franklin Thane because it was revealed in AUDIO: Month 25 that Jack Harkness' name during his Time Agency days was "Javic Piotr Thane".
Talk about it here.
Franklin was Javic Piotr Thane's father. He lived on the Boeshane Peninsula with his wife and his two sons, Javic and Gray. He used to play what appeared to be cricket.
During the attack by the "worst creatures in existence," he ordered Javic to flee with Gray, and, eventually, Franklin was killed by the creatures. Javic returned home to find his mother cradling Franklin's corpse.
Franklin later appeared to Javic, then going by "Jack Harkness", when he was hunting a Weevil in the sewers. The memory-changing alien Adam, masquerading as one of the Torchwood team, made Jack remember his past. Franklin was included in that illusion. (TV: Adam)