We based the age on when the ownership of the mine changed hands and when it was last worked.
I never intended to be a salesman all my life, and the company hasn't been the same since it changed hands.
The duchy afterwards changed hands several times, one of its holders being Charles of Valois, natural son of Charles IX.
The course of oriental conquest followed the events of European politics, and the possessions of European powers in the East generally changed hands according to the fortunes of their masters at home.
During the 13th and 14th centuries the castle and lordship changed hands very frequently; they were granted successively to Hubert de Burgh, whose son forfeited them after the battle of Evesham, to Richard, earl of Cornwall, whose son Edmund died without issue; to Piers Gaveston, and lastly to John of Gaunt, duke of Lancaster, and so to the Crown as parcel of the duchy of Lancaster.