Jamieson, Fausset and Brown on 1 Kings 15:10-13

10-13. his mother's name was Maachah--She was properly his grandmother, and she is here called "the king's mother," from the post of dignity which at the beginning of his reign she possessed. Asa, as a constitutional monarch, acted like the pious David, laboring to abolish the traces and polluting practices of idolatry, and in pursuance of his impartial conduct, he did not spare delinquents even of the highest rank.