Short answers, pulled from the story.
Cardinal Thomas Wolsey originally established the site in 1525 under the name Cardinal College before his fall from power halted construction at three-quarters completion. King Henry VIII refounded the institution in 1546 as Christ Church, creating a unique entity that serves simultaneously as an academic college and the cathedral of the Oxford diocese.
The resulting structure makes Christ Church the only academic institution globally that is also a cathedral seat. This dual status remains rare in the world today with the Dean of the cathedral acting as the head of the college by right of office.
The bell within this tower bears the name Great Tom and rings exactly 101 times each night at 9 pm measured by local Oxford time. This schedule translates to 9:05 pm GMT or BST every evening once for each of the original 100 scholars plus one additional stroke added in 1664.
Thirteen British prime ministers studied at Christ Church including Anthony Eden who served between 1955 and 1957. William Ewart Gladstone held office from 1828 to 1831 while Sir Robert Peel governed from 1841 to 1846 and Archibald Primrose led the government from 1894 to 1895.
Tom Tower stands as a famous gate-tower designed by Sir Christopher Wren atop Wolsey's Great Quadrangle which remains the largest quadrangle in Oxford. The bell within this tower bears the name Great Tom and rings exactly 101 times each night at 9 pm measured by local Oxford time.