From A Wiki of Ice and Fire
|Title||Prince of Dorne|
|Book(s)|| A Feast for Crows|
A Dance with Dragons
Prince Maron Nymeros Martell was a former Prince of Dorne.
Prince Maron signed the marriage treaty bringing Dorne under the rule of the Targaryen kings. In the treaty he agreed to marry his sister, Princess Myriah to Daeron II and in turn he would marry the daughter of Aegon IV, Daenerys Targaryen.
Together with Daenerys, Maron had multiple children. His eldest child, a son, presumably succeeded him as ruling Prince of Dorne.