Teresa, Contessa Guiccioli (1800 – 1873) was the mistress

Mistress (lover)

A mistress is a long-term female lover and companion who is not married to her partner; the term is used especially when her partner is married. The relationship generally is stable and at least semi-permanent; however, the couple does not live together openly. Also the relationship is usually,...

 of Lord Byron whilst he was living in Ravenna

Ravenna

Ravenna is the capital city of the Province of Ravenna in the Emilia-Romagna region of Italy and the second largest comune in Italy by land area, although, at , it is little more than half the size of the largest comune, Rome...

, Italy

Italy

Italy , officially the Italian Republic languages]] under the European Charter for Regional or Minority Languages. In each of these, Italy's official name is as follows:;;;;;;;;), is a unitary parliamentary republic in South-Central Europe. To the north it borders France, Switzerland, Austria and...

, and writing the first five cantos of Don Juan. She wrote the biographical account Lord Byron's Life in Italy.

Alexandre Dumas included her as a minor character in his novel The Count of Monte Cristo

The Count of Monte Cristo

The Count of Monte Cristo is an adventure novel by Alexandre Dumas. It is often considered to be, along with The Three Musketeers, Dumas's most popular work. He completed the work in 1844...

using the disguised name "Countess G-". Lord Byron also used this shortened name in his journals.