You misconstrued my point. I was answering the question about how the initiation and termination of glacial epochs occurred. The increase in global temperature since 1850 is more rapid by about a factor of two, over a period of about a century, than any other rise or fall in global temperature in the last 1000 years. What this means is that an increase of approximately 0.6 C in 100 years is double the rate at any other time (i.e., the maximum trend up or down over 100 years has been 0.3 C or less). This does not mean that there have not been more rapid temperature excursions (such as after a major volcanic eruption) where the rate of increase/decrease would have been much more rapid if extrapolated over 100 years. (If you have a 0.2 C drop in two years due to a volcanic eruption, that would be a 10 degree drop in 100 years -- which only happens if there is a major ocean current regime shift.)
I stated all that to explain why there isn't a discrepancy between what you say about the 13th and 14th centuries and what I said.