[ULPIANUS libro sexto decimo ad edictum. ] §6.1.72.prSi a Titio fundum emeris Sempronii et tibi traditus sit pretio soluto, deinde Titius Sempronio heres extiterit et eundem alii uendiderit et tradiderit, aequius est, ut tu potior sis.
[ULPIANUS in the sixteenth book on the Edict.] If you buy from Titius a tract of land belonging to Sempronius, and it is delivered to you after the price has been paid, and then Titius becomes the heir to Sempronius and sells and delivers the same land to another, it is more equitable that you should have the prior right.
nam et si ipse uenditor eam rem a te peteret, exceptione eum summoueres. sed et si ipse possideret et tu peteres, aduersus exceptionem dominii replicatione utereris.
For even if the seller himself were to claim the property from you, you would bar him by an exception; and moreover, if he himself were in possession and you were to claim it, you would use a replication against his exception of ownership.