I think in modern terms it's hard to appreciate how expensive that book would have been to make back then. The parchment is calfskin. In the medieval era, it w

I think in modern terms it's hard to appreciate how expensive that book would have been to make back then. The parchment is calfskin. In the medieval era, it was uncommon for noblemen to slaughter their livestock for anything, even food, unless exceedingly special occasions. That book would have probably cost at least as much as one or two small farms, which is money only noblemen had, and far more than a lord or even a king would have afforded save for some extreme circumstances or investment.