Question: Who was the brother of 16th century poet group the Wilton Circle's leader?

Context paragraphs:
The Dancers at the End of Time: The Dancers at the End of Time is a series of science fiction novels and short stories written by Michael Moorcock, the setting of which is the End of Time, an era "where entropy is king and the universe has begun collapsing upon itself".  The inhabitants of this era are immortal decadents, who create flights of fancy using power rings that draw on energy devised and stored by their ancestors millions of years prior.  Time travel is possible, and throughout the series various points in time are visited and revisited.  Space travellers are also common, but most residents of the End of Time find leaving the planet distasteful and clichéd.  The title of the series is itself taken from a poem by a fictitious 19th Century poet, Ernest Wheldrake, which Mrs. Amelia Underwood quotes in "The End of All Songs".  "Ernest Wheldrake" had been a pseudonym used by Algernon Charles Swinburne.

Wilton Circle: The Wilton Circle were an influential group of 16th-century English poets, led by Mary Sidney.  They were based at Wilton House, Wiltshire, which was run by the half-brother of Walter Raleigh.  Sidney turned Wilton into a "paradise for poets", and the circle included Edmund Spenser, Michael Drayton, Sir John Davies and Samuel Daniel.

Al-Tughrai: Mu'ayyad al-Din Abu Isma‘il al-Husayn ibn Ali al-Tughra'i (Arabic: العميد فخر الكتاب الملقب مؤيد الدين أبو إسماعيل الحسين بن علي بن محمد بن عبد الصمد الدؤلي الكناني; Persian: اسماعیل طغرایی اسپهانی‎ ‎ ) (1061 – c. 1121) was an 11th–12th century poet and alchemist.

Srinatha Kavi Sarvabhowmudu: Srinatha Kavi Sarvabhowmudu is a 1993 Telugu biographical film, based on the life of 15th century poet Srinatha, produced by Nandamuri Rama Krishna on Ramakrishna Horticultural Studios & Srimathi Movie Combines banner and directed by Bapu.  Starring N. T. Rama Rao, Jaya Sudha, Rajendra Prasad in the lead roles and music composed by K. V. Mahadevan.  The film is final movie of legendary actor "NTR" and it is also the first debut to Telugu famous comedians A.V.S & Gundu Sudarshan.

Severus Sanctus Endelechius: Severus Sanctus Endelechius (or Endelechus) was a 4th century poet and rhetorician, and the writer of "De Mortibus Boum" (or "Bovum"), i.e. "On the Deaths of Cattle.

Dafydd Llyfni: Dafydd Llyfni was a 17th century poet from Caernarvonshire, Wales.  His is known to have written a number of cywydd style poems (including one written in petition to the men of Anglesey, and one in petition to the men of Llanllyfni), and a 'carol of confession'.

Rama Saraswati: Rama Saraswati was 16th century poet from Kamrup, India.  He was well known for translation of entire Mahabharata to Kamrupi from Sanskrit.

Vali Gujarati Gazal Award: Vali Gujarati Gazal Award is a literary honour in Gujarat, India.  The award was instituted in 2005 by Vali Gujarati Gazal Kendra, run by Government of Gujarat, to perpetuate the memory of 17th century poet Vali Gujarati.  The Award is conferred annually to the Gujarati ghazal poets.

Mary Sidney: Mary Herbert, Countess of Pembroke (née Sidney; 27 October 1561 – 25 September 1621) was one of the first English women to achieve a major reputation for her poetry and literary patronage.  By the age of 39, she was listed with her brother Philip Sidney, Edmund Spenser, and William Shakespeare, as one of the notable authors of her time in the verse miscellany by John Bodenham, "Belvedere".  The influence of her "Antonius" is widely recognized: it stimulated a revived interest in the soliloquy based on classical models, and was a likely source (among others) for both the 1594 closet drama "Cleopatra" by Samuel Daniel and Shakespeare’s "Antony and Cleopatra" (1607).  Sidney was also known for her translation of Petrarch's "Triumph of Death", but it is her lyric translation of the Psalms that has secured her poetic reputation.

Ratnagiri Murugan Temple: Ratnagiri Balamurugan temple is an ancient Murugan temple situated in Thirumanikundram,Vellore, India.  It was built around the 14th century.  It is situated on top of a hill.  Ancient Hindu scriptures say where there is a hill, there is Lord Murugan.  Over the passage of time an ordinary sand structure was converted into a stone shrine.  The 14th Century poet Arunagirinathar has sung about this temple as 'Rathinakiri Vazh Murukane Ilaya Vaaramarar Perumaley', which means 'Murugan, the God of Devas resides in Rathinagiri'.

Supporting paragraphs: Wilton Circle Mary Sidney
Answer: Philip Sidney