According to Luke, which two rulers became friends on the day of Jesus' trial?

Answer: Herod and Pilate

After Herod mocked Jesus and sent him back to Pilate, Herod and Pilate became friends; before this they had been enemies.

“And even Herod and his soldiers ridiculed and mocked Him. Dressing Him in a fine robe, they sent Him back to Pilate. That day Herod and Pilate became friends; before this time they had been enemies.”— Luke 23:11-12 (BSB)