context: The Duchy administers bona vacantia within the County Palatine, receiving the property of persons who die intestate and where the legal ownership cannot be ascertained. There is no separate Duke of Lancaster, the title merged into the Crown many centuries ago – but the Duchy is administered by the Queen in Right of the Duchy of Lancaster. A separate court system for the county palatine was abolished by Courts Act 1971. A particular form of The Loyal Toast, 'The Queen, Duke of Lancaster' is in regular use in the county palatine. Lancaster serves as the county town of the county palatine.
question: কখন ডিউক অফ ল্যাঙ্কাস্টার উপাধি রাজমুকুটে মিশে গিয়েছিল?
answers: many centuries ago