All rectors and vicars are appointed by patrons, who may be private individuals, corporate bodies such as cathedrals, colleges or trusts, or by the bishop or directly by the Crown. No clergy can be instituted and inducted into a parish without swearing the Oath of Allegiance to Her Majesty, and taking the Oath of Canonical Obedience "in all things lawful and honest" to the bishop. Usually they are instituted to the benefice by the bishop and then inducted by the archdeacon into the possession of the benefice property—church and parsonage. Curates (assistant clergy) are appointed by rectors and vicars, or if priests-in-charge by the bishop after consultation with the patron. Cathedral clergy (normally a dean and a varying number of residentiary canons who constitute the cathedral chapter) are appointed either by the Crown, the bishop, or by the dean and chapter themselves. Clergy officiate in a diocese either because they hold office as beneficed clergy or are licensed by the bishop when appointed, or simply with permission.