Laurens Jacobsz Alteras (died 1622) was a Dutch (Zealandic) vice admiral from the 16th century. In 1607 he distinguished himself as Vice Admiral of a Dutch fleet under Jacob van Heemskerck in the Battle of Gibraltar. After the battle and van Heemskerck's, death he took control of the Dutch fleet. He died in 1622 while successfully defending a Dutch merchant fleet from an attack by a Spanish squadron.
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