Raniero Dandolo or Rainero Dandolo ( 1204–42) was a Venetian admiral and statesman, titled Procurator of San Marco and Vice-Doge of Venice, the son of the 41st Doge of Venice, from which year until his death, Enrico Dandolo, he is remembered for his blindness, piety, longevity, and shrewdness, and is infamous for his role in the Fourth Crusade and the Sack of Constantinople in which he, at age ninety and blind, led the Venetian contingent?