Historical clue formulations

• Gorilla that famously learned to 26-Down — 2025-03-25
• Gorilla who famously learned sign language — 2025-02-16
• Gorilla who was said to have developed the vocabulary level of a three-year-old human — 2024-06-19
• Lord High Executioner in "The Mikado" — 2021-09-14
• Gorilla who was famously taught sign language — 2015-11-18
• Baritone in "The Mikado" — 2015-05-24
• Executioner in "The Mikado" — 2013-12-23
• Gorilla pioneering in sign language — 2013-10-15
• Gorilla skilled in sign language — 2011-12-04
• Gorilla famously taught to use sign language — 2010-10-05
• Famous language-signing gorilla — 2004-03-14
• Clown of renown — 2003-07-31
• "The Mikado" character — 2003-02-19
• The Mikado's Lord High Executioner — 1994-11-21
• "Mikado" executioner — 1994-01-04