"Seeing your ideas take shape before you... That is why I became an engineer."
A Roegadyn from an imperial province in Ilsabard, Biggs was born without citizenship to a poor family of desert farmers. Lacking the most basic of rights, his life was hardship upon hardship ever since childhood. When he came of age, he was forced into the Garlean Army with the other youths of his village. Biggs, however, would not be party to the Empire's aggression, and chose the dangerous path of desertion. Alongside Wedge, a like-minded fellow met while training, he rigged a set of magitek armor to malfunction, and the pair made their escape during the confusion. They were doubtless terrified throughout their flight, for Garlean deserters, if found, are executed on the spot without impunity. Nevertheless, they managed to find succor within a group that had taken up arms against imperial aggression. With the group's help, they contacted Cid, who, by this time, was also in exile, and thus succeeded in safely reaching Eorzea.
Incidentally, Biggs delights in making models of the fantastical machina he has come across in his twenty-five summers, and many of his recreations can be seen lining the stalls of Ul'dah's Sapphire Avenue Exchange.