Dutch Captain: Jacob Sijvertszoon Spanheijm

De Sleutels van de Sont lists a Jacob Syvertsz. as serving the New Directors of Amsterdam in 1645. He commanded the ship Venetia (32 guns and a crew of 78 men). I wondered if this was the same man as Jacob Sijvertszoon Spanheijm, who served the Amsterdam Directors in 1652 and 1653. Up until the Battle of Portland (the Three Days Battle), he commanded the ship Elias (34 guns). The Elias was eventually captured by the English at the Battle of the Gabbard in 1653, and taken into their service. Jacob Sijvertszoon Spanheijm was killed in the Battle of Portland. I also wondered if the Venetia might have also served in the First Anglo-Dutch War. One of the two Venetias listed in The First Dutch War, Vol.IV, was actually named the Julius Caesar. Sources:

1. C. T. Atkinson, Ed., The First Dutch War, Vol.IV, 1910.
2. James C. Bender, unpublished manuscript "Dutch Ships 1600-1700", 2005.
3. Gerhard Wilhelm Kernkamp, De Sleutels van de Sont, 1890.