The colonies started by a proprietor include:
- Maryland - Founded by Lord Baltimore as a refuge for Catholics.
- Pennsylvania - Founded by William Penn as a haven for Quakers and religious freedom.
- Delaware - Initially part of Pennsylvania and granted to William Penn.
While Georgia and Virginia were indeed important colonies, they were primarily founded for different reasons. Virginia was a joint-stock colony, and Georgia was founded as a buffer against Spanish Florida and a place for debtors, but not specifically as a proprietary colony in the same sense as Maryland and Pennsylvania. Thus, the correct answers are Maryland and Pennsylvania as proprietary colonies.