The rotunda begun but never completed by Abbot Wulfric (1047–59) at St Augustine’s Abbey as a link between the church of St Mary and that of St Peter and St Paul is an unusual and ambitious example of mid-eleventh-century English architecture which partly survives (fig. 4.6, top). […] Many of these rotundae are known to have had a special funerary function (as was the case at Canterbury).
Source: wiktionary