In The Annotated Alice, Martin Gardner provides background information for the characters. The members of the boating party that first heard Carroll's tale show up in chapter 3 ("A Caucus-Race and a Long Tale"). Alice Liddell is there, while Carroll is caricatured as the Dodo (Lewis Carroll was a pen name for Charles Lutwidge Dodgson; because he stuttered when he spoke, he sometimes pronounced his last name as "Dodo-Dodgson"). The Duck refers to Robinson Duckworth, and the Lory and Eaglet to Alice Liddell's sisters Lorina and Edith.
Alice's Adventures in Wonderland was conceived on 4 July 1862, when Lewis Carroll and Reverend Robinson Duckworth rowed up the river Isis with the three young daughters of Carroll's friend Henry Liddell: Lorina Charlotte (aged 13; "Prima" in the book's prefatory verse); Alice Pleasance (aged 10; "Secunda" in the verse); and Edith Mary (aged 8; "Tertia" in the verse).
The journey began at Folly Bridge, Oxford, and ended 5 miles (8 km) upstream at Godstow, Oxfordshire. During the trip, Carroll told the girls a story that he described in his diary as "Alice's Adventures Under Ground", which his journal says he "undertook to write out for Alice". Alice Liddell recalled that she asked Carroll to write it down: unlike other stories he had told her, this one she wanted to preserve. She finally received the manuscript more than two years later.