It all started innocently enough:

Then a Twitter thread happened …

Well, there was only one possible reply to that:

One, or two, or a few more, anyway:

Twitter credits

@Basiliscoe
@BBCWDS
@BLMedieval (digitiser and home library of the Luttrell Psalter)
@CutPics
@dspmonkey
@lugnut
@Rainmaker1973 (originator of the thread)
@red_loeb (A #medievaltwitter creative agitator-in-chief; also a principal co-author)
@SimonDoubleday
@StephanieLahey (principal co-author)
@stephaniemain2
@themunson  

Research methodology

I had vaguely recollected seeing a squirrel in the Luttrell Psalter (British Library Add. MS 42130) but I couldn’t remember when, where, or how; in the flesh or online; so I reread that psalter until I found that squirrel again (f. 181v-182r). You will need to peer quite closely to spot our hero, who is only about one centimetre tall and known for being cannily evasive:

as for the full manuscript description and history: thereby hang many other tales …