William (Billy) Jennings was born in Barry, Wales, on 25th February, 1893. A talented footballer who represented the Welsh Schoolboy team, he played for Barry Town before joining Bolton Wanderers. He made his debut for the club against Derby County in November, 1912.
Although not a regular in the first-team at the time, in 1914, he won his first international cap for Wales. Over the next few years he won ten more caps for his country.
After the First World War he became a regular member of Bolton Wanderers side. Charles Foweraker, the manager, built a team that included Joe Smith, Ted Vizard, Jimmy Seddon, John Reid Smith, David Jack, Billy Butler, Dick Pym, Alex Finney and Bob Haworth.
Bolton Wanderers beat West Ham United 2-0 to win the 1923 FA Cup Final. Jennings was also a member of the Bolton team that beat Manchester City in the 1926 FA Cup Final. David Jack scored the only goal of the game in the 76th minute.
Jennings played in 287 league and cup games for Bolton before retiring in 1931. He was also the coach of Notts County and the manager of Cardiff City.
Billy Jennings died in 1968.