Concordia University in Chicago has created beautiful art history lessons on many popular artists. There are ten free art history lessons for each grade, from first through eighth grade.
Artists and Their Art: Sharing Visual Stories focuses mainly on art history by providing a biographical sketch of the artist, an image of one of the artist’s specific works and details about that work. It also provides class discussion questions and ideas for hands-on exploration. ~ Concorida University's description (bold emphasis mine)
Look through the free art history lessons for elementary and middle school at Concordia's site. Here is a partial screenshot of one lesson:
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