Her cultus was centered in Walsingham, home of the famous statue of the Virgin enthroned with the infant Christ in her lap.
The "Wilton Diptych" - showing the Three Dowry Kings presenting England to the Virgin as her Dowry, accompanied by John the Baptist (note the St. George's flag flying over the Virgin, held by an angel).
"On the Sunday after Corpus Christi 1381 in Westminster Abbey, King Richard II knelt amidst a great throng of his subjects to re-dedicate England to Mary, as her dowry. Westminster was the shrine of St. Edward the Confessor, traditionally held to have been the first to make this dedication and in whose reign Walsingham had been founded. Richard made at least two pilgrimages at this time to Our Lady's Shrine in Walsingham and to that of St. Edmund at Bury. The saintly Edmund, king of East Anglia, where Walsingham was situated, had been martyred for the faith by the Vikings in the 9th century. In the [Wilton] diptych (above) the three "dowry kings," as they are known, are depicted with St. John the Baptist, Richard's special patron.