When did Lisbon become the capital of Portugal?

Answer 1

People have been inhabiting Lisbon's region as soon as 8000BC, and from that time on until the year 1147 A.D. it was conquered and inhabited by a few other civilizations. At 1147 it was final conquered by the portuguese, and became oficially part of the portuguese territory.

Answer 2

Well, in 1128 the, soon to be the first Portuguese King, D. Afonso Henriques created the Portucalense county after a war against his mother's armys the king, in 1143, against the wishes of the Pope created Portugal.

Answer 3

In 1255.