What were the key events that led to the War of the Roses occurring in England during the 15th century. Was there any particular event that was the tipping point?
One of the events that led to the War of the Roses was the birth of a son, Edward, Prince of Wales, to (Lancastrian) King Henry VI, and his Queen, Margaret of Anjou.
Prior to that time, Richard, Duke of York (a cousin) had been next in line to the throne, and therefore had no incentive to fight. The birth of Henry's son "disinherited" him.