may bring different assises for the same thing on the deaths of two ancestors at one  and the same time, in which case the last seisin must be adjudicated [first]. But an  assise is not to be taken on an assise on the seisin of two ancestors between the same  persons with respect to the same thing, as where land is given to A. and B. his wife;  if A. dies first, seised, an assise on the death of A. does not lie for the heir during the  life of B., nor conversely. But when both die, an assise of mortdancestor lies for the  heir on the seisin of him who last died seised, but if the assise finds against the heir,  because of a gift made by him who last died seised, no recourse can be had to another  assise on the death of him who died first.1 If land is given to one thus, in maritagium  with his wife; no assise of mortdancestor lies except at the death of the mother, and  hence if he takes nothing by the assise on the death of the mother, he cannot have  recourse to the seisin of the father by the assise. The assise is not to be taken on an  assise in an assise of darrein presentment if the exception that it was taken at another  time is raised. If it is taken in error, when no mention was made of the first, a conviction  will lie, for the second, not the first, though faith is to be placed in neither  of them de jure. In assises to recognize utrum, an assise will never be taken on an  assise, though sometimes a conviction lies, because it determines the right and possession  and immediately passes over into the authority of res judicata, which provides  an exception.
That a conviction is not to be taken on a conviction.
 A conviction must not be taken on a conviction, any more than an assise on an assise.  Hence we must see, if a conviction follows a conviction, whether it is the same assise  as to which a conviction was formerly taken, the same thing or a different one, and  whether between the same persons or different ones.2 If it is one and the same person,  the same thing and the same assise, a conviction will never be taken on a conviction,  though emendation follows in another way, in the form of certification by examination,  as was seen in [the portion] on the taking of assises.3 If the persons are different,  the things and the assises different, as may often be seen by the records, a conviction  may well follow a conviction. From the taking of one assise sometimes one conviction  follows, sometimes two, as is evident, according as the jurors give to or take away  from one party the entire thing the plaintiff has put in his view or part of what he has  put in his view. If the jurors, where they ought to have given or taken away the whole,  give or take away part,4 two convictions follow, as may be seen by an example. A.  puts two carucates of land in his view