Queen Elizabeth and the Duke of York, Act, II, scene iv
Excerpt from the scene summary: Suddenly, the marquis of Dorset arrives with terrible news. He says that Elizabeth’s kinsmen, Rivers and Gray, have been arrested along with an ally of theirs named Sir Thomas Vaughan. They have been sent to Pomfret, a castle where prisoners are held and often killed. The order to arrest them came, not surprisingly, from Richard and his ally, Buckingham. Elizabeth and the duchess realize that this news probably means the beginning of the end for their family. They wail for their loss—and for what is to come. Knowing that Richard means her ill, Elizabeth decides to take her youngest son and flee to sanctuary—to a place where, she hopes, Richard cannot come after them. The cardinal promises his support and hands over to Elizabeth the Great Seal of England, a highly symbolic artifact.
Link to the full summary and the information source: SparkNotes, "Richard III" - http://www.sparknotes.com/shakespeare/richardiii/section6.rhtml
Image Source: Circulating Collection, Print and Picture Collection, Free Library of Philadelphia. Subject: King Richard III – Shakespeare.