Albert Barnes' Notes on the Whole Bible - Isaiah 45:1
Thus saith the Lord to his anointed - This is a direct apostrophe to Cyrus, though it was uttered not less than one hundred and fifty years before Babylon was taken by him. The word ‘anointed’ is that which is usually rendered “Messiah” (משׁיח mâshı̂yach), and here is rendered by the Septuagint, Τῷ χριστῷ μου Κύρῳ Tō christō mou Kurō - ‘To Cyrus, my Christ,’ i. e, my anointed. It properly means “the anointed,” and was a title which was commonly given to the kings of Israel, because... read more
The Pulpit Commentary - Isaiah 45:2
The secret of assured success. These figures indicate the removal of all obstacles and hindrances out of the way of him who is called of God, entrusted with some particular work for God, and helped of God in the doing of that work. Historical illustration is found in the fact, as stated by the older writers, that in some unaccountable way the river-gates of Babylon were found open on the approach of Cyrus; or, as stated on the authority of the monuments, that the city capitulated, as a... read more