From an anecdote about the Emperor Hadrian relayed by the Roman historian Cassius Dio.
At any rate, once, when a woman made a request of him as he passed by on a journey, he at first said to her, "I haven't time," but afterwards, when she cried out, "Cease, then, being emperor," he turned about and granted her a hearing.
Cassius Dio's Roman History, published in Vol. VIII
of the Loeb Classical Library edition, 1925, in the public domain and available online.