On 28 July 1864 on appeal , the decision of Thelwall v. Yelverton was reversed .
The House of Lords decided that William 's first marriage was illegal , and therefore his second marriage was valid .
On 28 July 1864 on appeal , the decision of Thelwall v. Yelverton was reversed , and the House of Lords decided that William 's first marriage was illegal , and therefore his second marriage was valid .