Dorne is the southernmost of the seven kingdoms of Westeros, divided from the rest of the continent by the Red Mountains. Only the narrow and well-guarded Prince’s Pass connects Dorne to the Reach, and thus the remainder of the continent. Dorne has for thousands of years been a peninsula of several kingdoms, but the coming of Princess Nymeria and her Rhoynish refugees brought power to House Martell sufficient to begin the unification of a single kingdom from Sunspear to Starfall. The battles to unify the kingdom of Dorne have continued for eight years, and are nearing their completion. Prince Mors Martell and his bride Nymeria rule the growing nation of Dorne from their seat at Sunspear.
The prime opposition to the unification of Dorne under House Martell is the mighty House Yronwood, long the most powerful great house of Dorne and seated on the opposite end of the region.