改元

改元	gǎi yuán	to change an emperor's or ruler's reign title (old)
改	gǎi	to change / to alter / to transform / to correct
元	Yuán	surname Yuan / Yuan dynasty (1279-1368)
元	yuán	currency unit (esp. Chinese yuan) / (bound form) first; original; primary / (bound form) basic; fundamental / (bound form) constituent; part / (prefix) meta- / (math.) argument; variable / era (of a reign) / (Tw) (geology) eon