In Corona de Hierro (Iron crown), each player represents an Italian noble in the 9th century, that will try to increase their power before the imminent death of King Carlos III, last of the Carolingian dynasty. To do this, he must send emissaries to negotiate with other nobles, with the Pope and with the barbarians, mobilize armies, besiege castles and win battles. The most powerful player at the time of the coronation (but not necessarily the new king) will be the winner of the match.
In this game, players take turn to take two actions among moving their armies in a map, besieging neutral/opponent castles to earn power and get prisoners, attach adjacent armies, send emissaries to pope and barbarians also to increase the power or draw cards that have various effects, mainly improving the other actions.
Each player has a secret objective that can give a bonus: To make another player (or perhaps himself) king.
At the end of the game, triggered when a player gets the crown, the noble with more points is the winner.