harry potter - Did any Gryffindor marry a Slytherin?

Supposedly House Gryffindor and House Slytherin have a centuries-old enmity, but at some point this must have been overcome at least by a few individuals.

In canon (books, Pottermore, interviews, anything with JKR's stamp of approval), has there ever been a Gryffindor-Slytherin marriage?

^{_{I'm sure one could write a good Romeo and Juliet-style story along these lines, but fanfics are NOT accepted!}}

Answer

I can't find any absolute confirmations, making this an excellent (and annoying) question! However, here are some possibilities/notes on the subject.

Known "family" houses

It is by no means guaranteed that family members are sorted into the same houses, but there are some patterns.

• James Potter, Lily Potter (née Evans), Harry Potter and James Potter Jr were all sorted into Gryffindor.


• Arthur Weasley and Molly Weasley (née Prewett), along with all their children, were Gryffindors.


• Lucius Malfoy, Narcissa Malfoy (née Black) and Draco Malfoy were all Slytherins.


• The Black family, bar Sirius, were all in Slytherin - as Slughorn said, "The whole Black family had been in my house, but Sirius ended up in Gryffindor! Shame — he was a talented boy. I got his brother Regulus when he came along, but I'd have liked the set."

The Black family tapestry

Based on this, I'm making an educated guess that members of the Black family tended to appear in Slytherin (and seemed to somehow disappear from the tapestry when they didn't), and that the Potters and the Weasleys tended to be Gryffindors. We know that members of the Longbottom and the Prewett family ended up in Gryffindor, but we don't have enough information to prove a family tradition.

A few traditionally "Gryffindor" names pop up on the Black family tapestry seen in the films. Although this isn't as canon as the books, we know JKR had a lot to do with the films, so it depends how much faith you put in that.

• Dorea Black (1920-1977) married Charlus Potter.


• Cedrella Black (unknown, likely 20th century based on tapestry placement) married Septimus Weasley (as pointed out by GreenMatt in the comments). Her spot is charred off the tapestry.

Also:

• Lucretia Black (1925-1992) married Ignatius Prewett.


• Callidora Black (1915-1996) married Harfang Longbottom.


• Arciorus (sp?) Black (1901-1991) married Melania Macmillan (possibly a relation of Ernie Macmillan, Hufflepuff).

Trivia

• Slytherins aren't always Death Eaters, or "Evil 4 Lyfe" - Regulus Black was a Slytherin and actively fought against Voldemort, albeit briefly; Slughorn was a Slytherin (and it's not difficult to picture him getting along with members other houses).


• Non-Slytherins aren't always great either, producing their fair share of Dark Wizards.


• There's a pretty big canon precedent for romantic feelings between Gryffindor and Slytherin - Lily and Severus did maintain a friendship for several years (more than can be said for any Gryffindors/Slytherins we know of during Harry's time), and Snape's feelings are pretty well-known by the final book. I'd be surprised if Snape was the only Slytherin to ever fall in love with a Gryffindor (or vice versa).


• Hogwarts was founded over a thousand years ago, and according to JKR, "Slytherin's discrimination on the basis of parentage was considered an unusual and misguided view by the majority of wizards at the time. Contemporary literature suggests that Muggle-borns were not only accepted, but often considered to be particularly gifted." Opinion changed in the 17th Century after Muggle persecution, but we might think that before then, many Slytherins may not have had the vitriolic view of Muggle-borns that would might put many Gryffindors off considering them as a potential partner.



• By no means a direct link, but an interesting Pottermore marriage tidbit I only discovered the other day: Celestina Warbeck was a Gryffindor and married three times (her backing dancer, her manager, and a composer). One of them may have been a Slytherin.

Based on that, I conjecture that it is very likely that a Slytherin and a Gryffindor married at some point.

A section of the tapestry, for reference: