The Trinity Alliance is a mutual protection and non-aggression pact between the Capellan Confederation, the Taurian Concordat, and the Magistracy of Canopus, signed in August of 3062. On the surface, the alliance was proposed by Sun-Tzu Liao as a means to advance the technology and internal capabilities of both the Concord and Magistracy. Beneath the surface, the Alliance was orchestrated as a power-play by Chancellor Sun-Tzu to tip the balance of power within the Inner Sphere in his favor:
- Mutual defense of the three realms allowed the Confederation to increase the size of its military, in particular by utilizing Canopian troops during the Capellan-St. Ives War.
- A strengthened Taurian Concordat and Magistracy of Canopus would be a thorn in the sides of the Federated Suns and Free Worlds League, respectively.
- And within the Second Star League, the new voting block of 3 realms eased the possibility of passing motions favoring Chancellor Sun-Tzu's policies.
Interestingly, a similar scheme was proposed by a previous Capellan Chancellor. Chancellor Arden Baxter of the nascent Capellan Confederation proposed the "Thousand-World Coalition" in 2422. However, the initial proposal was rejected by Regent-Protector Admiral Sigur Fonn of the Taurian Concordat.