Short answers, pulled from the story.
Bangor holds city status by ancient prescriptive right, derived from its long-standing cathedral and medieval privileges granted to the Bishop of Bangor. It is the only place in Wales to retain city status on this basis without a modern royal grant. In 1927 a government list confirmed it as the only medieval Welsh city with its rights still intact.
The Celtic saint Deiniol founded a monastic settlement on the site of Bangor Cathedral in the early sixth century AD. The Cathedral Church of St Deiniol is a Grade I Listed building; while Christian worship has continued on the site since the sixth century, the present building dates from the twelfth century.
Garth Pier is 1,500 feet long, making it the second longest pier in Wales and the ninth longest in the British Isles. It opened in 1893 and was restored between 1982 and 1988, reopening to the public on the 7th of May 1988.
The BBC's Light Entertainment Department moved to Bangor during the Second World War to escape the London Blitz. Classic radio programmes including It's That Man Again were produced from the city during that period. The BBC has maintained broadcasting facilities in Bangor ever since.
In 1967, The Beatles came to Bangor to attend their first meeting with Maharishi Mahesh Yogi, staying in Dyfrdwy, a hall of the Hugh Owen Building at Bangor University. During that visit, they received news of the death of their manager Brian Epstein.
Welsh was the majority language in Bangor in the early twentieth century: 75.8% of the population could speak it at the 1921 Census. By 2011 that figure had fallen to 36%, reflecting the large student population and the fact that 49.3% of residents were born outside Wales.