How did Joseph Haydn become Ludwig van Beethoven’s teacher?

Joseph Haydn became Ludwig van Beethoven’s teacher after the two met in Bonn in 1790, while Haydn was traveling to London. During this visit, Haydn was introduced to the young composer and shown some of his scores. Impressed by Beethoven’s work, Haydn offered to take him on as a pupil upon his return from England.12

Beethoven accepted this offer and moved to Vienna in the autumn of 1792 to begin his studies. Haydn held the young musician’s potential in high regard, famously stating in a 1793 letter that he would be proud to be called the teacher of a man who would one day be considered one of Europe’s greatest composers.12