 The need for smooth delivery of correspondence also led to the large scale repair or construction of roads and bridges along the postal route.Baybars attempted to institute dynastic rule by assigning his four-year-old son al-Said Barakah as co-sultan, thereby ending the Mamluk tradition of electing a leader, but this effort was ultimately unsuccessful, at least for his Zahirid household; successful rulership became highly dependent on Baybars' personal qualities.However, Baybars success in establishing centralized rule resulted in the consolidation of the Mamluk Sultanate.