Gerald Bostock is a fictional character created by Ian Anderson for his band Jethro Tull's 1972 concept album, Thick as a Brick; the character is also the focus of Anderson's 2012 solo album, Thick as a Brick 2.
Bostock's first appearance is on the original cover art and packaging of the album Thick as a Brick, which is designed to look like a small village periodical (that actually folds out into a full-length newspaper with 12 pages), entitled the St. Cleve Chronicle & Linwell Advertiser. The newspaper makes references to Gerald Bostock as a schoolboy who has written an award-winning epic poem called "Thick as a Brick." In the newspaper, Jethro Tull claims to have adapted his poem to music on their album (though Anderson in fact authored the lyrics himself).
Read more about Gerald Bostock: Thick As A Brick, Thick As A Brick 2, Further History