《晋书·志·第十九章》
元帝太兴二年，丹阳郡吏濮阳演的马生小马驹，有两个头，从脖子前分开，生下来就死了。
元帝太兴二年，丹阳郡吏濮阳演马生驹，两头，自项前别，生而死。
In the second year of Emperor Yuan’s Taixing reign, a horse belonging to Puyang Yan, an official in Danyang commandery, gave birth to a small foal with two heads, which were separated from each other in front of the neck, and which died as soon as it was born.