The masque Tethys' Festival is performed at Whitehall Palace to celebrate the investiture of Henry Frederick, Prince of Wales.

Tethys' Festival was a masque produced on 5 June 1610 to celebrate the investiture of Prince Henry (1594–1612) as Prince of Wales.

The Palace of Whitehall – also spelled White Hall – at Westminster was the main residence of the English monarchs from 1530 until 1698, when most of its structures, with the notable exception of Inigo Jones's Banqueting House of 1622, were destroyed by fire. Henry VIII moved the royal residence to Whitehall after the old royal apartments at the nearby Palace of Westminster were themselves destroyed by fire. Although the Whitehall palace has not survived, the area where it was located is still called Whitehall and has remained a centre of the British government.

Henry Frederick, Prince of Wales,, was the eldest son and heir apparent of King James VI and I and Queen Anne. His name derives from his grandfathers: Henry Stuart, Lord Darnley; and Frederick II of Denmark. Prince Henry was widely seen as a bright and promising heir to the English, Irish, and Scottish thrones. However, at the age of 18, he predeceased his father, dying of typhoid fever. His younger brother, the future Charles I, succeeded him as heir apparent to the thrones.

June 5 is the 156th day of the year in the Gregorian calendar; 209 days remain until the end of the year.