dynast
Concise Oxford English Dictionary © 2008 Oxford University Press:
dynast /ˈdɪnəst, ˈdʌɪnəst, -nast/
▶noun a member of a dynasty, especially a hereditary ruler.
– origin C17: via L. from Gk dunastēs, from dunasthai ‘be able’.
'dynast' also found in these Oxford entries:

