In 1650 Mizar was the first double one of these discovered; today we know it's actually a quadruple
ROBERT HOOKE... [DOC] [TLE] Mizar and Alcor, famous double star, are really six stars | Brightest ... [PAR] Apr 12, 2016 ... Mizar and its fainter companion star Alcor are one of the most famous double 
stars in the sky.