First Catalan-Aragonese King who consolidated his power in Aragon. His political machinations( including war) saw him delineate Aragons Boundaries. He also controlled Maritime Provence. He unified the coinages of Catalonia, Aragon and Provence.
@AK, I agree that this is a nice pick-up. I don't have the MEC, but this looks like C&C #1701 to me. The obv legend (on your left pic) is BARCINO, while the rev legend (on your right pic) is CI VI RE X. The mint is Barcelona.
"The danger we all now face is distinguishing between what is authentic and what is performed." -----King Adz