Sentence:  Roderic drew all his forces against him; Dermot Mac Moroogh sent to Robert Fitz Stephens, that in all haste he should draw forces to the ayde of Donald Prince of Limirike his sonne in law, which was accordingly affected, where Roderic was foyled, lost his <WSD>chiefery</WSD>, and with shame enough returned to his own country. 
Meaning of the word marked with <WSD> tags:  The status or role of a chief; chieftainship.