Original: Polydeuces was discovered by the Cassini Imaging Team on October 24, 2004, in images taken on October 21, 2004, C.C. Porco, et al., IAUC 8432: Satellites and Rings of Saturn November 8, 2004 (discovery) Porco, C. C.; et al.
Simplified: It was discovered by the Cassini Imaging Science Team in 2004.