The Saturnalia began on December 17 and lasted, in its imperial development, for seven days. It was the most popular festival in the Roman calendar, the one that Roman writers mention most frequently as a cherished institution, and the one whose customs have attracted the most scholarly attention for their relationship to the Christmas traditions that eventually overlapped with and largely replaced them. For the duration of the Saturnalia, Roman social life was deliberately inverted: slaves were served dinner by their masters, social distinctions were relaxed, gambling was legally permitted, gift-giving was universal, and the general atmosphere of licensed excess provided a temporary release from the hierarchical rigidity that organized Roman life during the other fifty weeks of the year.