Knight miniatures recommendation.

[Maniac]

If you have access to a resin printer:

https://www.myminifactory.com/object/3d-print-early-100yw-knights-with-great-helms-383616

https://www.myminifactory.com/object/3d-print-early-100yw-knights-with-great-helms-383616

https://www.myminifactory.com/object/3d-print-early-14th-century-deutschritter-370504

https://www.myminifactory.com/object/3d-print-early-14th-century-knight-with-great-helmet-392146

https://www.myminifactory.com/object/3d-print-late-13th-century-knight-for-28mm-wargaming-free-miniature-350224

[bluewillow]

For my second barons war  i used a mix of
Mirliton knights mounted
Fireforge foot
Mirliton and foundry command


Then for my Scottish wars
Claymore and antediluvian miniatures 
Mirliton and claymore mounted
Old glory bits

[rampantlion]

I'm a fan of Essex for that time range.  They hold up well vs more modern sculpts and have a lot of interesting detail on their armor I think.  They're not as tall as some of the newer figs but not far off either.  They are a little chunkier but that helps them blend in I think.