Adrahil was the twenty-first Prince of Dol Amroth. He was in direct descent from the first Prince Galador.
Adrahil was father of Imrahil, twenty-second Prince of Dol Amroth, and Finduilas.
Finduilas married Denethor II, who became Steward of Gondor eight years after he married Finduilas. Finduilas died about four years after, and caused Denethor to become a more grim and silent man, who preferred being alone.
Addendum by webmaster: Denethor II and Finduilas were the parents of Boromir of the Fellowship and of Faramir II. Faramir II became the Steward of Gondor for High King Elessar, and became the Prince of Ithilien.