Juan Mackenna
…Monaghan, Ireland, the son of William MacKenna, of Willville House near Monaghan town, and Eleanora O'Reilly and, on his mother's side, a nephew to Count Alejandro O'Reilly. Count O'Reilly took an interest in the young Mackenna and took him to Spain where he studied at the Royal School of Mathematics in Barcelona. He also…