Robert d'Aillebout d'Estimauville de Beaumouchel (February 17, 1827 â September 27, 1895), better known as Robert Desty, was a Canadian American lawyer and politician. He was elected to the California State Senate in 1879, but was denied his seat on the grounds that he was not a naturalized citizen. He served in the United States Army during the MexicanâÂÂAmerican War.