The eldest son of a Duke, Marquess or Earl almost always uses one of his father's subsidiary titles as a courtesy title; for instance, the eldest son of the Earl of Snowdon is called Viscount Linley.
The eldest son of a Duke, Marquess or Earl almost always uses one of his father's subsidiary titles as a courtesy title. The eldest son of the Earl of Snowdon is called Viscount Linley. This was for instance.