I want to know the answer to the following question:
When did the Mielnik Polish–Lithuanian union reform?
All the background I'm provided with is that "On 23 October 1501, at Mielnik Polish–Lithuanian union was reformed at the Union of Mielnik (Polish: unia mielnicka, unia piotrkowsko-mielnicka).". Is that enough to answer the question?
Answer: yes