In December 1908 Eva, then 41, married Houston Stewart Chamberlain, a British-born historian who had adopted as his personal creed a fanatical form of German nationalism based on principles of extreme racial and cultural purity. He had known Cosima since 1888, though his affinity with Wagner extended back to 1882, when he had attended the premiere of "Parsifal". He had successively courted Blandina and then Isolde, before settling on Eva. Cosima had considerable empathy with his theories; according to Carr "she came to love him as her son—perhaps even more". Chamberlain became the dominant figure within the Wagner circle, and was largely responsible for the increasing alienation of the Beidlers. Cosima may have been unaware of Isolde's attempts at rapprochement, because Eva and Chamberlain withheld Isolde's letters. In 1913 Isolde was effectively disinherited when she sought to confirm her rights as a co-heir to the considerable Wagner fortunes in a court case, which she lost. After this she withdrew, and to the time of her death in 1919 never again saw or communicated directly with Cosima.