Ibn Umar used to have a freedwoman of his named Safiyyah ride behind him on his mount when she traveled with him to Mecca.
حدثنا نصر بن علي حدثنا أبو أحمد حدثنا سفيان عن عبيد الله
أن ابن عمر كان يردف مولاة له يقال لها صفية تسافر معه إلى مكة
No references are available.
[Sahih] Bayhaqi narrated it 5/226 from the hadith of Abu Dawud, through him. Sufyan Thawri was followed by Uqba bin Khalid.