Sentence:  And there rises a shining palace whose crystal glittering roof is seen by mariners who traverse the extensive sea in barks built expressly for that purpose, and <WSD>thither</WSD> come all herds and fatlings and firstfruits of that land for O'Connell Fitzsimon takes toll of them, a chieftain descended from chieftains. 
Meaning of the word marked with <WSD> tags:  To that place.