In the garden of his own house - It was probably a burying-place made for his own family, for Amon his son is said to be buried in the same place, 2 Kings 21:26.
Was buried - The catacomb of David was probably full, and the later kings, from Ahaz downward, had to find sepulture elsewhere. Ahaz was buried in Jerusalem, but not in the sepulchres of the kings 2 Chronicles 28:27. Hezekiah found a resting place on the way that led up to David‘s catacomb 2 Chronicles 32:33. Manasseh and Amon were interred in “the garden of Uzza,” a portion (apparently) of the royal palace-garden; perhaps so called after the name of the previous owner. Josiah was buried in “his own sepulchre” 2 Kings 23:30.
Amon his son - This name, which occurs only at this time and in the reign of the idolatrous Ahab 1 Kings 22:26, is identical in form with the Hebrew representative of the great Egyptian god, Amen or Amun (Nahum 3:8 margin); and it is therefore probable that Manasseh selected it and gave it to his son in compliment to the Egyptians.