House of Gréine of the Northern Isles of the Lakes and Valleys

The House of Gréine of the Northern Isles of the Lakes and Valleys is a Rockallic originating from An Eoila tÓ Nuarth. It is the oldest royal house of Rockall and many of its members were the direct rulers of the islands of Eoil Sceilge and Mionncárraig.

The House spawned several, the most influential of which were the House of Gréine of West which is currently an influential family in the Highlands, the House of Gréine of Duaidhebh which ruled the Kingdom of Duaidhebh between 1452 and 1498 and then the following Kingdom of Léubheithritha from 1498 till 1763, and the House of Gréine Dùinneach and Rom who ruled over much of current-day Rom between 1478 and 1584.

Titles

 * King of Gréine is the title borne by the leader of the House. It originates from the House's long royal reign over the Eoila tÓ Nuarth, and its continued use was permitted under the Royal Titles Act of 1792.
 * Prince of the Two Rivers is the title traditionally borne by the heir to the kingship. The title is an ancient one and originates from the pre-Kingdom Principality of the Two Rivers, and came under use of the House following the marriage between King Drealge III of Gréine and Meralda, Princess of the Two Rivers in the 12th century.
 * Prince of Flower Lake is the title borne by the eldest of the Gréine of the Lakes branch, which is currently the leader of the House following the reincorporation of the collateral branch into the main branch of the House in 1874.
 * Duke of Mount Léaichlin is the title traditionally borne by the second in line to the kingship. It came under the House together with the title of Prince of the Two Rivers, due to the Principality merging with the Duchy of Mount Léachlin in around 350 A.D., after which the title was a secondary title used by the Prince of the Two Rivers.
 * Duke of Perlannin is the inherent title used by the King of Gréine as direct descendant of the House of Perlannin, and was granted to the King of Gréine following the extinction of the House of Perlannin in the 9th century.

West Branch

 * Duke of the West is the title used by the leader of the Gréine of the West branch, a collateral branch with direct links to the main branch of the house.
 * Lord of Silence is the title used by the leader of the Gréine of the West branch as a . The title has carried no legal weight since 1645 but remains in use.

Duaidhebh Branch

 * King of Léubheithritha is the title borne by the Gréine of Duaidhebh. It originates from the House's reign over the Kingdom of Léubheithritha between 1452 and 1678.
 * Prince of Duaidhebh is a substantive title used by the heir to the kingship of the Gréine of Duaidhebh branch. It is a remnant of the House's original rule over the Kingdom of Duaidhebh prior to it being annexed by the Kingdom of Léubheithritha following the marriage between King Dréi V of Gréine of Duaidhebh and Queen Éila of Gréine of Léubheithritha.