The club's earliest challenge games began in 1913/14 from get-togethers of former Trinity Academy pupils (opened in 1892 as Craighall Road School) in a shelter at Starbank Park, Newhaven.

Between the 2 World Wars Trinity was a lower grade, fairly average in terms of results, junior club.

Frank Trotter, then Executive Officer of Education for Leith, gave the club access to a regular home ground, Bangholm, which was opened on 2 December 1920.

Less familiar names now largely forgotten include: Brunstane, Kenard, Westhall, Warriston, Gala Star, Edinburgh Rover Scouts, Kenmore, United Colleges, James Clarks FP, Grange, Broxburn HSFP, Balvaird and Dunedin.

Most senior clubs expected lower teams to beat their 2nds over a number of years before they would be considered for a 1st xv fixture.

However, 14–6 and 24–3 wins over Fettes and 6–8 and 12–14 losses to Edinburgh Wanderers / Academicals ("Charie Maclean scoring 3 tries") suggest playing improvements since before the war.

By the 1950s we had regular fixtures with: Melrose, Langholm, Stewarts, Edinburgh Wanderers, Melville College and Selkirk (who by tradition we played away on 1 January.)

A strong run of results – including victories over Stewarts (in a year when they won the championship), Melrose, RHS, Selkirk and Langholm – led to our appearing in the league table from 1963 to 1964.

After many years in favour of an organised league structure, Trinity gave its full support to the SRU's proposal to introduce a formal system in 1973.

10 - 15 L Glenrothes 16 - 3 W Alloa 22 - 3 W Cambuslang 4 - 3 W Dumfries 20 - 4 W Peebles 18 - 3 W Clarkston 20 - 10 W The season started badly for a team captained by Andy Wilson and coached by Ian Henderson with defeats in two out of the first three games.

Captained by Reece Calder, with Richard Wood & Neil Morrison coaching, the club finished the season with 9 wins, 2 losses and 1 draw.

Reports list the team as: A Fairfull, D Graham, C Hepburn, J Meikle, E Cessford, G Armstrong and J Scott, with victories over Leith 15–0, Stewarts 9-0 and Edinburgh Wanderers / Accies 8–0.

Over the years the efforts of Alex Harper, Allan Spencer, and the long term rector Peter Galloway have kept the club well-supplied with players from school.