Why is the city of st Davids so important to Cristian's?

Answer 1

The question does not state where St Davids is refereed to However, one that does stand out is;

In about the 6th century, David founded a monastery and church at Glyn Rhosyn (in english, Rose Vale) on the banks of the River Alun (said Alin). The area was originally known in the Welsh language as Mynyw(said as Mun ew)and to the Romans as Meneva or Menevia. The monastic brotherhood that David founded was very strict - besides praying and celebrating masses they would cultivate the land and carry out many crafts, this included beekeeping, in order to feed themselves and the many pilgrims and travellers who needed lodgings. They also fed and clothed the poor and needy from the area. The settlement that grew up around the monastery was called Tyddewi (said simply as tith ew ee) meaning "David's house". In 519 the archbishopric of Caerleon in the county of Monmouth was transferred to Mynyw, which was renamed "St Davids" in honour of the archbishop and saint by whom the transfer was accomplished.The original cathedral built on the site was often plundered by the Vikings and was finally burnt and destroyed in 1087. The present cathedral was built by the Normans and contained many relics, including the remains of St David. It was visited by many pilgrims, many of whom were nobles and kings, including William the Conqueror in 1077, Henry II in 1171, and Edward I and Queen Eleanor in 1284. Pope Calixtus II decreed that two pilgrimages to St David's were equivalent to one to Rome ("Roma semel quantum dat bis Menevia tantum"). Because of this, a vast income was raised from visiting pilgrims in the Middle Ages. Pilgrimages later fell out of favour due to practices such as the selling of indulgences, and the income from them faded away.