Career
Thor Reirsen Lilleholt was born on the Lilleholt farm in Holt parish in Aust-Agder, Norway. During the period 1803-1817, he was sheriff in Holt, and from 1803 to 1812 also in the neighboring parish of Dypvåg. He represented Nedenæs amt (now Aust-Agder) at the Norwegian Constituent Assembly in 1814, together with Jacob Aall and Hans Jacob Grøgaard.
At the Assembly, he supported the union party (unionspartiet).