at what point then was this river renamed after henry hudson.rking for the dutch, looking for that northwest passage, but it wasn't until the english saw how important this part of the world was that they decided they're going to name it the hudson river, because hudson was an english subject. right there ahead of us, right off the bow. that is the pollepel island, home of bannerman's castle. why is that island not get any closer? we're going to need to step on it here. the tide's coming in! there's not just a surprise around every corner, there's living history. johnny devenanzio: from 1901 until his passing in 1918 francis bannerman constructed the castle on pollepel island as a means to house army surplus and munitions. frank bannerman, the sixth, he was the father of the army navy store. this is the man, right here. that's the man. that's him. so this castle was built as a warehouse. it was a safe place to have his gunpowder and a safe place to store cannons and munitions. this was his man cave. his wife was like listen honey you're not keep