David
Psalm 80:9ESV·traditional attribution

You cleared the ground for it; it took deep root and filled the land.

John Calvin Reformed @genevareformer

PSALM 80 This is a sorrowful prayer, in which the faithful beseech God that he would be graciously pleased to succor his afflicted Church. To excite him the more readily to grant them relief in their distressing circumstances, they compare these circumstances with the condition of the Church in her beginnings, when the Divine favor was conspicuously manifested towards her. To the chief musician upon Sosannim Eduth.

Commenting on Psalm 80:1-19

C.H. Spurgeon Reformed Baptist @princeofpreachers

"Thou preparedst room before it." The weeds, brambles, and huge stones were cleared; the Amorites, and their brethren in iniquity, were made to quit the scene, their forces were routed, their kings slain, their cities captures, and Canaan became like a plot of land, made ready for a vineyard.

Matthew Henry Presbyterian @wholebiblehenry

The psalmist is here presenting his suit for the Israel of God, and pressing it home at the throne of grace, pleading with God for mercy and grace for them. The church is here represented as a vine (Psa 80:8, Psa 80:14) and a vineyard, Psa 80:15. The root of this vine is Christ, Rom 11:18. The branches are believers, Joh 15:5.

Commenting on Psalm 80:8-19