'Cordelia' is an important character in which Shakespear’s literary work -

King Lear, tragedy in five acts by William Shakespeare, written in 1605–06 and published in a quarto edition in 1608, evidently based on Shakespeare’s unrevised working papers.

The aging King Lear decides to divide his kingdom among his three daughters, allotting each a portion in proportion to the eloquence of her declaration of love.
The hypocritical Goneril and Regan make grand pronouncements and are rewarded;
Cordelia, the youngest daughter, who truly loves Lear, refuses to make an insincere speech to prove her love and is disinherited.
Source: Britannica.com