Who was the “judge” at the time of King Saul?

I admire Binyamin's ability to ask such difficult questions that the rabbi doesn't know how to answer them.

{13} And on the second day the heads of the fathers' houses of all the people, the priests and the Levites, were gathered together unto Ezra the scribe, and unto Hashil the scribe, concerning the words of the law: {14} And they found written in the law, which the LORD had commanded by the hand of Moses, that the children of Israel should dwell in booths in the feast of the seventh month: {15} And they heard and proclaimed in all their cities, and in Jerusalem. For they went out to the mountain and brought olive branches, and oil-tree branches, and myrtle branches, and palm branches, and fig-tree branches, to make booths, as it is written: (P) {16} And the people went out, and brought them, and made them booths, every man upon his roof, and in their courts, and in the courts of the house of God, and in the broad place of the water gate, and in the broad place of the gate of Ephraim: {17} And all the multitude of the captivity made booths of The people made booths and lived in booths, for the children of Israel had not done so since the days of Joshua the son of Nun until that day. And there was great joy.

9 He will take hold of the heel of a donkey; he will fasten upon him with a rope.
10 His rope is hidden in the earth; and his trap is on the path.
11 He will surround him with a trap; and he will scatter him at his feet.
12 Famine will be his lot; and a fever will be ready for his bones.
13 He will eat, even his skin; he will eat with his hands, the firstborn of death.
He will be cut off from his tent, from his confidence; And you shall go forth, to the king of Bela.
15 He shall dwell in his tent, from his own place; he shall spread brimstone upon his bed.
16 From below, his roots shall wither; and from above, his harvest shall be cut off.
17 His memory shall perish from the earth; and he shall have no name from without.
18 He shall be driven from light into darkness; and from the wilderness he shall be driven.
19 He shall have neither son nor grandson among his people; And there is no remnant, in his dwellings.
20 On his day, the latter breathed; and the former, they held the gate.

How is this related?

What is the connection between verses describing the work of Ezra (450 BCE) and King Saul (1050 BCE)?