First article in a series on ancient Peruvian textiles drawn from the Science Museum of Minnesota's collection of about 150 mostly fragmentary specimens. It surveys Peruvian prehistory and chronology, the development of cotton and camelid fibers, spinning, dyeing, the backstrap loom, textile specialization, and burial practices. It then describes knotted weft wrapping, an openwork technique especially associated with Chancay on the Central Coast, covering its structure, materials, and patterning variations (embroidery, tapestry, scaffold weaving), with museum examples and a note on how a weaver can reproduce it.