For the middle Caroline construction I've opted for a symbol representing a three word unit that completes the name of something a Spanish monarch was involved in. I'm Ok with thematic entries 1, 2 and 5 as well but can't get anywhere on number 4 (which needs to occupy 8 cells by my reckoning). Any hints here most welcome.
Really enjoyed this one and didn't mind that the endgame has required plenty of lateral thinking since that makes the PDMs even more delicious!