Principality of Calenberg
In 1665, Christian Louis died, and was temporarily succeeded by George's third son John, who usurped the throne over George's second son George William, who then held the Principality of Calenberg. George William soon displaced John in Lüneburg, but had to cede Calenberg to John, and also the Principality of Grubenhagen, which had been acquired by the House of Lüneburg in 1617.