וַיָּקֻ֥מוּ עֲבָדָ֖יו וַיִּקְשְׁרֽוּ־קָ֑שֶׁר וַיַּכּוּ֙ אֶת־יוֹאָ֔שׁ בֵּ֥ית מִלֹּ֖א הַיּוֹרֵ֥ד סִלָּֽא׃
And his servants arose, and made a conspiracy, and smote Joash at Beth-millo, on the way that goeth down to Silla.
Rashi on II Kings
Selo. The name of a place.16Scripture describes the location of Beis Millo, “that leads down to Selo” which was near Yerusholayim, because there was another Beis Millo near Shechem mentioned in Shoftim 9:6, 20.—Malbim