E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Thule (2 syl.).
Called by Drayton Thuly. Pliny, Solnus, and Mela take it for Iceland. Pliny says, It is an island in the Northern Ocean discovered by Pytheas, after sailing six days from the Orcads. Others, like Camden, consider it to be Shetland, still called Thylens-el (isle of Thyl) by seamen, in which opinion they agree with Marinus, and the descriptions of Ptolemy and Tacitus. Bochart says it is a Syrian word, and that the Phnician merchants who traded to the group called it Gezirat Thul (isles of darkness). Its certain etymology is unknown; it may possibly be the Gothic Tiule, meaning the most remote land, and connected with the Greek telos (the end).
Where the Northern Ocean, in vast whirls,
Boils round the naked melancholy isles
Of farthest Thulë.
Ultima Thul. The end of the world; the last extremity. Thule was the most northern point known to the ancient Romans.
Tibi serviat Ultima Thule.
Virgil: Georgics, i. 30.
Peshawar cantonment is the Ultima Thule of British India.Nineteenth Century, Oct., 1893, p. 533.