How and why did the plan of medieval churches change during the Romanesque period?

What will be an ideal response?

The ideal Answer should include:
1. In response to the ever-growing collections of relics, Romanesque churches needed additional chapels.
2. Large interior spaces were necessary to accommodate the crowds of pilgrims who visited churches to venerate these relics.
3. To accommodate the movement of large crowds of pilgrims from shrine to shrine, Romanesque builders added an ambulator around the apse encircled by a string of chapels with altars and relics.
4. This permitted pilgrims to circulate freely from chapel to chapel without disrupting regular church services in the main apse.