 During Sultan Baybar 's reign ( 1260 – 1277 ) , a barid ( postal route ) was created between Egypt and Syria , which enabled the sultan to remain constantly notified of developments in the provinces . It served as a major centralizing factor in the Mamluk state , and each postal station required transport horses , which the tribes provided . According to Sato , the tribes ' supply of horses and camels was " indispensable for the maintenance " of the barid . Noble horses and young camels were also provided by the amir al @-@ ʿarab to the royal stables of the Mamluk sultans on an annual basis . Under the early Ottomans , the amir al @-@ ʿarab was required to provision the sultan 's stables with 1 @,@ 050 young camels and 30 young horses , the collective annual value of which was 240 @,@ 000 akçe . This formed part of the sultan 's revenue from the Damascus Eyalet . 
