Coat of arms of Ivatt

The blazon

ar. on a cross gu. five fleurs-de-lis of the field. — Crest, out of a mural coronet, an armed cubit arm, holding in the gauntlet, all ppr. a fleur-de-lis or. [Confirmed to Thomas Ivat, of London, Esq. 27th June, 1626.]

A blazon is the description of a coat of arms in the technical language of heraldry. The drawing comes from that text, and from nothing else.