Sentence:  For distant India tremble may // Beneath your mighty rule, // And <WSD>Thulé</WSD>⁵ bow beneath your sway // Far in the Northern sea, // But if to care and want you're prey, // No king are you, but slave. 
Meaning of the word marked with <WSD> tags:  The semi-legendary island of classical antiquity considered to represent the northernmost location in the inhabited world (the Ecumene).