S. E. Fryer, Dictionary of National Biography… (1912)
“ Blind, though never naturalised, thenceforth made England his permanent home, and for more than half a century devoted himself without intermission to literary support of 'nationalism' and democratic progress in Germany and elsewhere. His house at Hampstead became a rendezvous for political refugees from Europe, and filled a prominent place in the history of all advanced political movements. He welcomed to England Mazzini, who became an intimate friend, and whom he introduced to Swinburne. ”
