968. After the war Professor Slughorn planned to remain at Hogwarts for only a few more years. He wanted to both ensure that a suitable replacement teacher could be found and wanted to give the kids some consistency over the next few years. He made it his special mission to help find the Muggleborns who were prevented from going to Hogwarts in 1997-8. As those few years turned to decades, his work was recognized by the highest authority of fame, Chocolate Frog cards. He was oddly humble about it.