Context: It was granted its Royal Charter in 1837 under King William IV. Supplemental Charters of 1887, 1909 and 1925 were replaced by a single Charter in 1971, and there have been minor amendments since then.

Question: When did the Royal Institute receive its charter?
Answer: 1837

Question: Who was responsible for giving the charter to the Royal Institute?
Answer: King William IV

Question: In what years was the Royal Institute issued supplemental charters?
Answer: 1887, 1909 and 1925

Question: When were the various supplemental charters consolidated?
Answer: 1971

Question: What term characterizes the nature of changes to the charter after 1971?
Answer: minor amendments

Question: When did the Royal Institute lose its charter?
Answer: Unanswerable

Question: Who was responsible for taking the charter from the Royal Institute?
Answer: Unanswerable

Question: What years was the Royal Institute issued no supplemental charters?
Answer: Unanswerable

Question: When were the various supplemental charters increased?
Answer: Unanswerable

Question: What term characterizes the nature of changes to the charter before 1971?
Answer: Unanswerable