Napoleon shaped his Empire with the expansion of dynastic possessions, the cultivation of princely clientele and the establishment of satellite and allied states. He built his imperium on the foundation of historic French relationships. This expansion began with the Revolutionary Republic and achieved its fullest extent under the Empire. Expansion was not pursued as a universal principle, but instead, each state became a part of a grand strategic objective related to respective enemies. In some cases, states served as buffers between France and their immediate enemies, but shortly thereafter served a dual role as offensive and defensive components of the Republic, and later Napoleonic Empire.