1903: Boro move to Ayresome Park, with Celtic the first visitors for a pre-season friendly. First league game against Sunderland ends in a 3-2 defeat.
1905: Boro cause a sensation by paying £1,000 for centre forward Alf Common, the first ever four figure transfer fee. Goalkeeper Tim Williamson, above, becomes Boro's first England international when capped against Ireland in a game played at Ayresome Park.
1906: Andy Aitken replaces Alex Mackie as manager.
1909: Andy Walker is new manager.
1911: Tom McIntosh starts nine-year spell as manager.
1914: Best ever league season with Boro finishing third in the First Division.
1923: Herbert Bamlett takes over as manager.
1924: Relegation to Division Two.
1927: Peter McWilliam replaces Bamlett as manager and sees Boro promoted to Division One as Division Two champions. George Camsell, above, creates a Second Division record by scoring 59 league goals, while the team scored a total of 122 league goals.
1928: Relegation after just one season in the top flight.
1929: Champions again - and another promotion to the First Division.
1934: Wilf Gillow is new manager.
1936: Boro reach sixth round of the FA Cup only to lose 3-1 to Grimsby.
1944: Manager Wilf Gillow dies and is replaced by David Jack.