Reference for Bava Kamma 41:12
ואיכא דמתני להא שמעתא באפי נפשה מחזרת רב אמר חייבת ושמואל אמר פטורה ולשמואל משלמת מה שהזיקה היכי משכחת לה דמחייבא כגון דשבקה לרחבה ואזלה וקמה בצידי רחבה
There was a case where a certain person built a villa upon ruins that had belonged to orphans. R. Nahman thereupon confiscated the villa from him [for the benefit of the orphans]. May it therefore not be inferred that R. Nahman is of the opinion that he who occupies his neighbour's premises without having any agreement with him must still pay him rent? — [The case of the orphans is based on an entirely different principle, as] that site had originally been occupied by certain Carmanians<span class="x" onmousemove="('comment',' I.e., persons who came from Carmania. According to a different reading quoted by Rashi a.l. and occurring also in MS.M., it only means 'Former settlers'. ');"><sup>9</sup></span>