1)
To which of his ancestors does he refer?
1.
'Rashi': Pul and Tiglas Pil'eser, Malchei Ashur (Divrei ha'Yamim I, 5:26).
2)
What is the connection between the other gods and Hashem?
1.
Malbim (Yeshayah 36:20): Just like the other gods could not or did not want to save their nations from me, the same applies to your G-d.
