1)
Who was "Tilgas Pilne'eser"?
1.
'Rashi': He was a king of Ashur before Sancheriv. The order of kings was Pul in the days of Menachem ben Gadi, Tiglas 1 Pilne'eser in the days of Pekach ben Remalyah, Shalman'eser in the days of Hoshe'a ben Elah, and Sancheriv in the days of Chizkiyah.
2.
'Rashi', from Sanhedrin 94a: This (and the others that 'Rashi' brought - refer to 5:6:2:1) is one of the names of Sancheriv.
1
Radak: Tiglas is Tilgas; often, letters are switched in names.
2)
Why does it say "Hu Nasi la'Reuveni"?
