Probably Penelope Devereux, daughter of Lettice Knollys, great-granddaughter of Mary Boleyn
Penelope Rich, Lady Rich, later styled Penelope Blount, Countess of Devonshire (1562 – 7 July 1607) was an English noblewoman. She was the sister of Robert Devereux, 2nd Earl of Essex and is traditionally thought to be the inspiration for "Stella" of Sir Philip Sidney's Astrophel and Stella sonnet sequence (published posthumously in 1591).  She married Robert Rich, 3rd Baron Rich (later 1st Earl of Warwick) and had a public liaison with Charles Blount, Baron Mountjoy, (later first Earl of Devonshire), whom she married in an unlicensed ceremony following her divorce from Rich. She died in 1607.
Born Penelope Devereux, she was the elder daughter of Walter Devereux, 2nd Viscount Hereford, later 1st Earl of Essex and Lettice Knollys, daughter of Sir Francis Knollys and Catherine Carey, and sister of William Knollys, later 1st Earl of Banbury. Catherine Carey was the daughter of Lady Mary Boleyn by either her husband Sir William Carey, Gentleman of the Privy Chamber, or her lover King Henry VIII.
Her father was created Earl of Essex in 1572. Penelope was a child of fourteen when Sir Philip Sidney accompanied her distant cousin Queen Elizabeth on a visit to Lady Essex in 1576, on her way from Kenilworth, and must have been frequently thrown into the society of Sidney, in consequence of the many ties between the two families. Essex died at Dublin in September 1576. He had sent a message to Philip Sidney from his death-bed expressing his desire that he should marry his daughter, and later his secretary wrote to the young man's father, Sir Henry Sidney, in words which seem to point to the existence of a very definite understanding.
Penelope's brother, Robert, Viscount Hereford, inherited the Earldom of Essex on their father's death in 1576, and Penelope, her sister Dorothy, and younger brother Walter were entrusted to the guardianship of their kinsman Henry Hastings, 3rd Earl of Huntingdon. In 1578 their widowed mother married the Queen's favourite, Robert Dudley, Earl of Leicester. Perhaps the marriage of Lady Essex with the earl of Leicester, which destroyed Philip Sidney's prospects as his uncle Leicester's heir, had something to do with the breaking off of the proposed match with Penelope. In January 1581 Penelope arrived at court accompanied by her guardian's wife Catherine, Countess of Huntingdon, who was Leicester's sister and Sidney's aunt. In March 1581 Huntingdon as her guardian secured the queen's assent through Lord Burghley, Master of the Court of Wards, for her marriage with Robert Rich, 3rd Baron Rich (later 1st Earl of Warwick). Penelope is said to have protested in vain against the alliance with Rich.
Penelope's children by Robert Rich were:
* Robert Rich (1587-1658), later 2nd Earl of Warwick
* Henry Rich (1590-1649), later 1st Earl of Holland
* Sir Charles Rich (d. 1627), died unmarried and without issue
* Lettice Rich (d. 1619), married firstly Sir George Carey and secondly Sir Arthur Lake
* Penelope Rich, married Sir Gervase Clifton
* Essex Rich, married Sir Thomas Cheeke
* Isabel Rich, married Sir John Smith
Penelope Rich was considered one of the beauties of Elizabeth's court. She was golden-haired with dark eyes, a gifted singer and dancer, fluent in French, Italian, and Spanish.
Penelope is traditionally thought to have inspired Philip Sidney's sonnet sequence Astrophel and Stella (sometimes spelled Astrophil and Stella). Likely composed in the 1580s, it is the first of the famous English sonnet sequences, and contains 108 sonnets and 11 songs. Many of the poems were circulated in manuscript form before the first edition was printed by Thomas Newman in 1591, five years after Sidney's death.
Whether Sidney fell passionately in love with Penelope in the years between her arrival at court in 1581 and his own marriage in 1583, or whether the "Stella" sonnets were courtly amusements reflecting fashionable poetic conceits may never been known. In her essay "Sidney, Stella, and Lady Rich", Katherine Duncan-Jones writes:
No one since 1935 has seriously doubted that Sidney intended the first readers of Astropil and Stella, whoever they may have been, to link "Stella" with Lady Rich. The exact nature of Sidney's relationship with the famous beauty is another and much more ticklish matter ..."
Sidney died of wounds received at the Battle of Zutphen in 1586. In 1590, Penelope's brother Essex married Sidney's widow Frances, daughter of Sir Francis Walsingham, and Lady Rich was much cultivated by poets and musicians during her brother's ascendancy at court in the 1590s.
The minor poet Richard Barnfield dedicated his first work, The Affectionate Shepherd, published anonymously in November 1594, to Penelope Rich. Bartholomew Yong dedicated his translation of Jorge de Montemayor's Diana (1598) to her; and sonnets are addressed to her by John Davies of Hereford and (to her portrait by Nicholas Hilliard) by Henry Constable.
The queen's miniaturist Nicholas Hilliard is known to have painted two miniatures of Lady Rich, in 1589 and 1590 respectively. One was given to James VI of Scotland (later James I of England) and the other to the French ambassador. A miniature in the Royal Collection (above) may be one of these.
Charles Tessier dedicated his book of part-songs in French and Italian, Le premier livre de chansons, to "Madame Riche", commending (in Italian) her musical judgement , and John Dowland composed "My Lady Rich's Galliard" in her honour.
Penelope's marriage to Rich was unhappy and by 1595, she had begun a secret affair with Charles Blount, Baron Mountjoy. Lord Rich took no action during the lifetime of Penelope's brother, the powerful Earl of Essex, who had become the aging queen's favourite in the years after the death of Leicester in 1588.
But Penelope was tainted by association with her brother's plotting, and after Essex's execution for treason in 1601, Lord Rich had Penelope and her children by Mountjoy cast out. Lady Rich moved in with her lover, and the couple began a very public relationship. Mountjoy was created earl of Devonshire on the accession of James I, and Lady Rich was in high favour at court,. She was among the ladies who escorted Anne of Denmark on her entry to London in 1603 and served Anne as a Lady of the Bedchamber.  She danced as the nymph Ocyte in Ben Jonson's Masque of Blackness on Twelfth Night 1605.
In 1605, Rich sued for a divorce, and Penelope wanted to marry Blount and legitimise their children. In the divorce proceedings, she publicly admitted to adultery. The divorce was granted, but the requests to remarry and legitimise her children were refused. She married Blount in a private ceremony conducted by his chaplain, William Laud, afterwards Archbishop of Canterbury, on 26 December 1605 at Wanstead House in London. This proceeding, carried out in defiance of canon law, was followed by the disgrace of both parties, who were banished from court by King James. The couple continued to live together as husband and wife with their children until his death a few months later. Blount died on 3 April 1606 and Penelope on 7 July 1607.
Penelope's illegitimate children acknowledged by Charles Blount were:
* Mountjoy Blount (1597-1663), later 1st Earl of Newport
* Elizabeth Blount
* John Blount
* Ruth Blount (d. 1690), married Christopher Tilghman