Which couple’s tomb was ‘discovered’ at Glastonbury Abbey? The Saturday quiz

The questions

1 Which couple’s tomb was “discovered” at Glastonbury Abbey in 1191?
2 The M’Naghten rules are concerned with the legal definition of what?
3 Which singer was nicknamed the Empress of the Blues?
4 What was Jesus’s native language?
5 “The Banker – Himself” was a credit on which TV show?
6 What only became a public holiday in Scotland in 1958?
7 Which heron is known for its booming call?
8 Which mid-18th-century conflict has been called the first world war?
What links:
9 Stars; Rip It Up; The Race; American Idiot; All Rise; Galileo; Crush?
10 Boat; bottle indentation; former currency; gamble; kick?
11 Davis; Dellinger; Froines; Hayden; Hoffman; Rubin; Weiner?
12 The Emperor; Flights; Snow White and Russian Red; Solaris?
13 Old Indian coin; heavenly food; Australian lizard; grassland; African clawed frog; excessively cheerful?
14 Charing Cross; Notre Dame; Roman Forum; Zhengyangmen Gate?
15 Abraham Lincoln; Pyotr Stolypin; Todor Panitsa?

The answers

1 King Arthur and Guinevere.
2 Insanity.
3 Bessie Smith.
4 Aramaic (scholarly consensus).
5 Deal or No Deal.
6 Christmas Day.
7 Bittern.
8 Seven Years’ war.
9 Musical artist rainbow colours: Simply Red; Orange Juice; Yello; Green Day; Blue; Indigo Girls; Tessa Violet.
10 Punt definitions.
11 Chicago Seven activists on trial in 1969.
12 Books by Polish authors: Ryszard Kapuściński; Olga Tokarczuk; Dorota Maslowska; Stanislaw Lem.
13 Ending in -anna, getting longer: anna; manna; goanna; savanna; platanna; Pollyanna.
14 Zero point for measuring road distances: London; Paris; (ancient) Rome; Beijing.
15 Assassinated in theatres: US president, Washington, 1865; Russian PM, Kyiv, 1911; Bulgarian revolutionary, Vienna, 1925.