Yet another legend first documented in 1887 associates the name of the town with a legendary creature called a Marukos (spelled "manrukos" in the 1887 text). In the legend, a group of youths were playing around and being noisy while loitering around near the floodplains of the Bued River between Rosario and Sison on a Sunday. They were then confronted by an old man in white garb, whose flesh looked like a corpse - the Marukos. The creature accused them of engaging in leisure activities on a holy day and put a curse on them, causing them to lose their sense of direction. As a result, they failed to notice that they were about to be swept away by one of the flash floods that often plagued the river. In the end, only a young girl survived the encounter with the Marukos, by clinging to a "Balingkawanay" (Pittosporum pentandrum) tree. According to the account, some stories claim that the girl had survived by praying the Rosary, while other stories say that her name was Rosario. Either way, the story of the Marukos became closely associated with the etymology of the town of Rosario, which used to be part of Pangasinan.