Reference for Yevamot 230:8

יצחק ריש גלותא בר אחתיה דרב ביבי הוה קאזיל מקורטבא לאספמיא ושכיב שלחו מהתם יצחק ריש גלותא בר אחתיה דרב ביבי הוה קאזיל מקורטבא לאספמיא ושכיב מי חיישינן לתרי יצחק או לא אביי אמר חיישינן רבא אמר לא חיישינן

a son of R. Bebai's sister, once went from Cordova to Spain<span class="x" onmousemove="('comment',' [H]. So Golds. against Rappaport in [H] p. 156ff. Cordova at that time, as during the Moorish reign and other periods of spanish history, may have formed an independent state. [Obermeyer p. 183 identifies the former with Kurdafad near Ktesifon on the left bank of tigris, and the latter with Apamea, a frontier town of Babylon on on the right bank of the Tigris]. ');">²¹</span> and died there. A message was sent from there [in the following terms]. 'Resh Galutha Isaac, a son of R. Bebai's sister, went from Cordova to Spain and died there. [The question thus arose] whether [the possibility that there might have been] two [men of the name of] Isaac is to be taken into consideration<span class="x" onmousemove="('comment',' Even when it was not definitely known that there were two such persons in the same place. ');">²²</span> or not? — Abaye said: It is to be taken into consideration:<span class="x" onmousemove="('comment',' Even when it was not definitely known that there were two such persons in the same place. ');">²²</span>

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