Game crashes whenever I try to load it

So I've managed to run the same save for 101 years under House Targaryen starting off as Aegon during Aegon's Conquest. I've just encountered a problem however as I'm conquering Pentos that the game suddenly crashes at random points. Most of the time I'm easily able to just reboot the game, load the file, and continue playing. However this time the game just crashes whenever I try and reload the autosave or the two previous old autosaves. I'd really like to not loose this game as I've been keeping records of everything that happens in my own versions of the White Book and a history book about House Targaryen. If anyone has any advice, please help me. This is the save file, uploaded to dropbox: www.dropbox.com/s/02e2150t9yk6etx/Current%20Targaryen%20Save.ck2?dl=0

Seriously, I really don't want to lose this save. Any and all help is appreciated.