Elizabethan era

The Elizabethan era was the time period in England during the reign of Queen Elizabeth I.

The Zygons first attempted their invasion of Earth in 1567, it was also that period when the Tenth Doctor married Elizabeth.

In 1599, the Tenth Doctor and Martha Jones travelled to Elizabethan London and met William Shakespeare. The Doctor also met and ran afoul of Elizabeth herself. (TV: The Shakespeare Code)