For a comprehensive list of "D" saints, click on this link.
Dames Point Bridge over the Saint Johns River in Florida
Which Saint Mary? There are many.
Saint Patrick did not 'start' any country. He did go to Ireland as a missionary but did not found that country.
23rd April is Saint George's Day (Patron Saint of England)
For a list of many of the saints whose names start with T click on this link.
Saint Benedict started his Monastery in Monte Cassino.
Saint Bernadette did not start a religious community.
Saint Anselm of Canterbury (d. 1109) was not beatified but was canonized in 1492 by Pope Alexander IV.
No, Monica was not a foundress.
1st March = Saint Davids Day Gavin.
determineddiligent
Cannes or Saint Tropez