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Since we know that Dumbledore was teaching by the 1910s (to teach Newt) and Slughorn began around the same time, can we say that he would have taught Cassiopeia Black (who would have begun in 1926, when Slughorn was definitely teaching!) -- thus definitely making her, Pollux and Dorea Slytherin wizards along with every Black after them? If so, can we change the infobox? --HarryPotterRules1 (talk) 12:06, September 15, 2016 (UTC)

Newt was born 1897 so his full term at Hogwarts would have been c. 1908-1916 (but he was expelled for some part of this). Dumbledore was a Transfiguration teacher during at least some of that time. Molly says Slughorn "was at Hogwarts for ages, started around the same time as Dumbledore, I think", but throughout the Horace Slughorn chapter in Short Stories from Hogwarts of Power, Politics and Pesky Poltergeists his teaching term is repeatedly stated as 50 years and ending in 1981.
  • "Slughorn undoubtedly had a good eye for latent talent; over a fifty-year period numerous members of the Slug Club, hand-picked by him..."
  • (Voldemort's downfall on 31 Oct 1981) "A few days later, Slughorn (who had now completed a half century of service to the school) tendered his resignation."
Overall, I think Molly's unsure statement is the weakest of the evidence and that Slughorn's tenure started right about 1931, but even then he didn't become head of Slytherin House right away. "When offered the job of Potions master at Hogwarts he was delighted to accept, having a great flair for teaching and a deep fondness for the old school. Subsequently promoted to Head of Slytherin house, Slughorn remained a good-tempered and easy-going man." Given all this, I don't think we can say for sure if Cassiopeia, Pollux, and Dorea Black can be counted in Horace's statement that "The whole Black family had been in my House, but Sirius". --Ironyak1 (talk) 18:42, September 15, 2016 (UTC)

Still, he was teaching at that time... so even if he wasn't yet head of Slytherin, he would know what house they were in and the "my house" was him simplifying rather than saying "I taught them before I was head of Slytherin, then became head of Slytherin, so it became my house." In simply put terms, he was at Hogwarts when they would be; Callidora would be 1926 - 1933 (0r 27 - 34, depending on what month she was born); she'd be a fifth year when Slughorn began, Cedrella third and Charis first... so he'd have all of them being taught by him and would know their houses if he ever had to take house points off them. So, by that, we can say, undoubtedly, that they were Slytherins and that every Slytherin after 1931 was too. --HarryPotterRules1 (talk) 23:53, September 15, 2016 (UTC)