French post built before 1685 at the confluence of the Abitibi and Frederick House rivers, Ontario. Shown on map No. 24. This was probably the post shown on Jaillot's map 1685 (No. 85) and 1696 (No. 117) though this map is imperfectly drawn.

This post is marked "Old House" on Arrowsmith map of 1832 (No. 101) and "Old Log Tent" on the 1824 map. The first Frederick House was probably built at this point. See Frederick House.