<sod >An auction of artwork belonging toÃÂÃÂ billionaire David Rockefeller has fetched an unprecedentedÃÂÃÂ $646mÃÂÃÂ (ÃÂÃÂ£476m) on itsÃÂÃÂ first night.< eod>< sod > An auction of artwork belonging to late billionaire David Rockefeller has fetched an unprecedentedÃÂÃÂ $647mÃÂÃÂ (ÃÂÃÂ£478m) on itsÃÂÃÂ first night.< eod>