 However , at times Rosebery 's behaviour could be eccentric . Gladstone remarked that Rosebery was , perhaps , rather too concerned with his health . Early in the marriage Rosebery decided to renovate the small ruined <unk> Castle ( the original Rosebery family seat ) , close to , and within sight of , Dalmeny House . Once renovation was complete in 1882 , Rosebery used it as a private retreat from his family , and began to spend his nights there alone . Always an <unk> , he claimed that the " <unk> of the waters [ the nearby Firth of Forth ] were conducive to sleep . " Books were his passion , and he assembled a huge library in the small castle . Thus Rosebery was able to lead a life at Dalmeny with his wife , but also quite apart from her . 
