Salamun Alaikum Chadiga,
Please see verses 79:23-4, where the Quran tells us:
079:23-24
"Then he gathered (men) and called out. Then he said: I am your lord, the most high"
Regardless of what other Pharaoh's of Egypt may / may not have thought before him, this particular Pharaoh in opposition to Prophet Moses (pbuh) thought he was God most high! He may have called out on 'lesser Gods', but in this verse, it is clear he thought of himself as a Lord (Rab) 'al-ala' (The most high).
I hope that helps, God willing.
Regards,
Joseph.