Here's a short story:

The Royal Institute of British Architects (RIBA) is a professional body for architects primarily in the United Kingdom, but also internationally, founded for the advancement of architecture under its charter granted in 1837 and Supplemental Charter granted in 1971. 

Originally named the Institute of British Architects in London, it was formed in 1834 by several prominent architects, including Philip Hardwick, Thomas Allom, William Donthorne, Thomas Leverton Donaldson, William Adams Nicholson, John Buonarotti Papworth, and Thomas de Grey, 2nd Earl de Grey. 

After the grant of the royal charter it had become known as the Royal Institute of British Architects in London, eventually dropping the reference to London in 1892. In 1934, it moved to its current headquarters on Portland Place, with the building being opened by King George V and Queen Mary. 

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. (End of story)

Provide your best guess for the following question. Give ONLY the guess, no other words or explanation.

For example:

Guess: <most likely guess, as short as possible; not a complete sentence, just the guess!>

Here are a few examples of questions and answers:

Question: Where is the Royal Institute of British Architects located?
Guess: Portland Place,

Question: Which country?
Guess: United Kingdom

Question: Who chartered it?
Guess: King William IV.

Question: Who opened it?
Guess: severa architects

Question: Why was it created?
Guess: for the advancement of architecture

Question: What was it first known as?
Guess: the Institute of British Architects in London

Question: When was the name changed?
Guess: 1837

Question: When was it moved?
Guess: 1934

Question: Who was present for its opening?
Guess: the king and queen

Question: Their names?
Guess: George V and Mary

Question: How many additions were made to the original charter?
Guess: three

Now answer the following question in the same format.

Question: When were they all combined?

1971