A line start/end post or corner post (1) for a fence, the post including a first metal picket (2) to be driven into the ground (5) in a substantially vertical position, a reinforcing element that includes a second metal picket (3) to be obliquely placed between the first picket (2) and the ground (5) within a non-sink part taken from the first picket (2), and a connecting element (4) made of fence wire and connecting a first extremity (3b) of the second picket (3), laid on the ground (5), to the first picket (2).