The Cathedral's history goes back to 597AD when St Augustine, sent by Pope Gregory the Great as a missionary, established his seat (or 'Cathedra') in Canterbury. In 1170 Archbishop Thomas Becket was murdered in the Cathedral and ever since, the Cathedral has attracted thousands of pilgrims, as told famously in Geoffrey Chaucer's Canterbury Tales. 
Through The Centuries
.597 St Augustine arrived in Kent and soon established the first Cathedral 
1070-1077 Cathedral rebuilt by Archbishop Lanfranc 
1098-1130 New Quire built over a Crypt (present Western Crypt) 
1170 Thomas Becket murdered in the Cathedral 
1175-1184 Quire rebuilt. Eastern Crypt, Trinity and Corona Chapels added (all as seen today) 
1220 Becket's body placed in new Shrine in Trinity Chapel 
1377-1405 Lanfranc Nave demolished and rebuilt as seen today; Cloister vaulting inserted 
c1450 Pulpitum Screen constructed 
1498 Bell Harry Tower extended and the Cathedral largely complete as seen today 
1538 Becket's Shrine destroyed by Henry VIII 
1540 Monastery dissolved by royal command 
1541 New Foundation of Dean and Chapter established 
1660-1704 Repair and refurbishing after Puritan damage 
1834 North West tower rebuilt 
1954 Library rebuilt, repairing War damage 
1986 altar of the Sword's Point (Martyrdom) restored 
1988 Compass Rose placed in the Nave 
2000 International Study Centre opened in the Precincts