U kontekstu izlaganja razvoja instituta clausula rebus sic stantibus, premda u rimskom pravu nije postojao opći institut koji bi mu odgovarao, u romanistici se upućuje na remissio mercedis kod locatio fundi kao istaknuti primjer uvažavanja promijenjenih okolnosti od strane rimskih pravnika. Polazeći od općih karakteristika ugovora o zakupu te uređenja odgovornosti stranaka, u radu se analiziraju uređenje i argumentacija primjene instituta remissio mercedis iz perspektive promijenjenih okolnosti. Na temelju navedenoga, ispituje se u kojoj bi mjeri bila riječ o istoj liniji promišljanja o utjecaju izvanrednih vanjskih događaja na obveze ugovornih stranaka u rimskom pravu i u doktrini klauzule rebus sic stantibus.; In the context of studies concerned with the development of clausula rebus sic stantibus, although acknowledging the fact that this legal institute was not present in Roman law, some Romanists have pointed out the remissio mercedis in the lease of land (locatio fundi) as the prominent example when the change of circumstances influenced the obligations of parties in Roman law. Starting with the general characteristics of the contract of lease and the obligations of the parties, the authors analyze in the contral part of the paper the institute remissio mercedis and its basis, taking into account different opinions and arguments for its application. This is especially done from the viewpoint of changed circumstances, leading to the conclusion on the difference in the line of thought about the effects of changed circumstances in the Roman law remissio mercedis and in the medieval clausula rebus sic stantibus.