Sentence:  Elliston was, in his day, the Napoleon of Drury Lane; but, like the conqueror at Austerlitz, he suffered his declensions, and the Surrey became to him a Saint Helena. However, once an eagle always an eagle; and Robert William was no less aquiline in the day of adversity than in his <WSD>palmy</WSD> time of patent prosperity. 
Meaning of the word marked with <WSD> tags:  Prosperous, flourishing, booming or thriving. (from 17th c.)