The 2263 death of Ambassador Spock, the elder Spock from the original timeline, which led his younger counterpart to reflect on his own future.
Ambassador Spock had come from the original timeline after the destruction of Romulus and stayed in the Kelvin timeline, helping the Vulcan survivors build a new home. In 2263 the younger Spock learned that his elder counterpart had died.
The news made the younger Spock think about leaving Starfleet to help the Vulcan people. Among the ambassador's belongings he found a photograph of the elder Spock with his original crew. He chose to remain with the Enterprise.