A eighth-century Pictish king whose father was called Tallorc. He may be the origin of Tristan (Tristram), as in Welsh legend, Tristanís father is called "Tallwrch". However, Drustanus, the name on the Tristan Stone, precedes Drust.

In the Irish tale The Wooing of Emer, Drust appears as a companion of Cuchulainn, the Irish counterpart of Gawain. Aspects of Drustsís adventures in Emer are echoed in the early Tristan legends.