Needs JAL info.
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Henry Gordon Jago was the owner of the Palace Theatre in London.
Biography
Jago had an aunt named Maude who was still alive in the 1890s. She lived in Margate and had recently become engaged to a fishmonger named Robert Botcherby. (JAL: The Spirit Trap)
Sometime prior to 1881 he presented the so-called "Monstre Gathering", which featured Madame Vastra (known as "The Amazing Lizard Lady") as the main act. (REF: The Brilliant Book 2012)
In 1889, Li H'sen Chang performed his magic act at the Palace Theatre. Secretly, Chang was doing the work of Magnus Greel, who was kidnapping and cannibalising women to heal himself. Jago helped the Fourth Doctor with his investigations on the disappearances, believing him to be a police officer. Chang's plan was revealed during a performance and he tried to commit suicide, while Magnus escaped.
Litefoot joined forces with Henry Gordon Jago to find where Magnus escaped to. They followed him to the House of the Dragon, where they were captured by members of the Tong. The Doctor tried to help free them, but he was captured as well. During the final confrontation with Magnus, Jago and Litefoot helped to distract Mr. Sin, with Jago taking a glancing blow from a laser. (DW: The Talons of Weng-Chiang)
He may have sold the Palace Theatre after these events. (MA: The Shadow of Weng-Chiang) At some later point he obtained the New Regency Theatre. (JAL: The Theatre of Dreams)
Jago and Litefoot later descended into the London sewers to kill the rest of Greel's remaining giant rats with a Gatling gun and on the way there, failed to recognise the Fifth Doctor, who had regenerated since their first encounter with him. (BE: A Victorian Interlude)
His association with Professor Litefoot continued beyond their adventure with the Doctor. (EDA: The Bodysnatchers) The pair were involved as amateur sleuths in several other mysteries. (CC: The Mahogany Murderers, JAL: Jago and Litefoot)
In 1894, Jago spent time with his sister in Brighton, after a bout of dyspepsia. (EDA: The Bodysnatchers)
He was long dead by the time that the New Regency Theatre, which he had owned and operated in the 1890s, was destroyed in the Blitz at 8:47 p.m. on 12 October 1940. (JAL: Swan Song)