I've moved this out because it seems silly to quantify how real-world heritages feel about one another – even if it is hundreds of years ago.

Attitude Chart

HeritageByzantinesDanishEnglishFrankishIrishItalianMoorishNorwegianNormanScottishSpanishWelsh
ByzantinesPNNNNATNANNN
Danish TPANANNAGNNN
English NAPANTNAHATN
Frankish PT NN
Irish NANTPTTAHGTG
Italian TP AN
Moorish T P NNH
Norwegian G A PNAN
Norman H PAA
Scottish N G AAPGG
Spanish N N T HATPN
Welsh G HGNP