They all show seals of Afonso Henriques, first king of Portugal (1109-1185), encircled by castles and coats of arms: the 1144 seal is on the €1 and €2 coins; the 1142 seal is on the 10, 20 and 50-cent coins, and the very first royal seal of 1134 is on the 1, 2 and 5-cent coins.
The edge lettering on the €2 coin consists of five coats of arms and seven castles equally spaced.
€ 2
€ 1
50 cent
20 cent
10 cent
5 cent
2 cent
1 cent
