Formalized merger between the Federated Suns and the Lyran Commonwealth.
The official joining was consummated upon Victor Steiner-Davion's ascension to First Prince in 3055. In practical terms the bringing together of the realms had begun much earlier - shortly after the marriage of Hanse Davion and Melissa Steiner in 3028.
The alliance effectively ended in 3057 when Katherine Steiner-Davion withdrew the Lyran side and renamed it the Lyran Alliance. The formal decoupling of Steiner and Davion realms occurred after the FedCom Civil War, ending in 3067.
Clan Invasion 3050 - 3061
Civil War 3062 - 3067