SummarySymbolic perception of the church door in early English exegetical writings and in medieval liturgical practice is illustrated and discussed as the wider context of a proposal that the arched iron strip at the top of the twelfth-century church door at Stillingfleet, North Yorkshire, represents the rainbow of Noah's Flood, perceived as a reminder ofjudgement past and of judgement still to come, and as a symbol of the covenant between God and humanity. The possibility is considered that on other surviving early medieval church-doors too, the rainbow shape, even if primarily functional or dictated by the shape of the door-opening, and notwithstanding the absence of other figural imagery, may have been recognized as an emblem of the covenant, basis of all church-sanctioned contracts, aptly dislayed on the threshold—where various liturgical or other formal actions had their setting—of the sacred spaces of the domus dei.