 Nonetheless, the classical architecture of the Renaissance from the outset represents a highly specific interpretation of the classical ideas.In a building like the Ospedale degli Innocenti in Florence by Filippo Brunelleschi, one of the earliest Renaissance buildings (built 1419–45), the treatment of the columns for example has no direct antecedent in ancient Roman architecture.During this time period, the study of ancient architecture developed into the architectural theory of classical architecture; somewhat over-simplified, one could say that classical architecture in its variety of forms ever since have been interpretations and elaborations of the architectural rules set down during antiquity.