Peter Tempesta
Peter (1291 – 29 August 1315), called Tempesta (meaning "storm"), was the Count of Eboli from 1306.
He was the eighth son of Charles II of Naples and Mary of Hungary (see Elizabeth of Sicily).
His sobriquet came from his stormy temperament.
In 1309, he received Nocera and Isernia and exchanged Montescaglioso for Sorrento and Castellammare di Stabia.
He began serving his brother, King Robert, against the Ghibellines of Uguccione
della Faggiuola in Tuscany.
He led 300 knights and was given the title of "Vicar of Tuscany, Lombardy, Romagna, the city of Bertinoro, and the city of Ferrara and Captain-General of the Guelph party of Tuscany".
He celebrated a jubilee at Siena and then moved on to Florence, where he stayed with the Mozzi family and the commune granted him a stipend of 4,000 florins.
He took Arezzo on 29 September 1314, but Uguccione took Lucca.
At Robert's request, Philip I of Taranto brought reinforcements north and met with initial successes, but at the Battle of Montecatini, the combined forces of the Guelphs were defeated by Uguccione and the Ghibellines in a skirmish on the plain.
Peter and Philip retreated to Fucecchio and the former died "en route", in the marsh, his body was never found.
Lyon Cohen
Lyon Cohen( 1868–1937) was a Polish- born Canadian businessman and a philanthropist.
He was the grandfather of singer/ poet Leonard Cohen.
Mary of Hungary, Queen of Naples
Mary of Hungary (c. 1257 – 25 March 1323), of the Árpád dynasty, was Queen consort of the Kingdom of Naples.
She was a daughter of Stephen V of Hungary and his wife Elizabeth the Cuman.
Mary served as Regent in Provence in 1290–1294 and in Naples in 1295–96, 1296–98, and 1302, during the absences of her consort.
Abd al-Muttalib
Abd al- Muttalib Shaybah ibn Hashim( c. 497 – 578) was the grandfather of Islamic prophet Muhammad.
Henry Krause
Henry J." Red" Krause, Jr.( August 28, 1913 – February 20, 1987) was an American football offensive lineman in the National Football League for the Brooklyn Dodgers and the Washington Redskins.
He played college football at St. Louis University.
He is the grandfather of Jennifer Krause
He is the great grandfather of Payton Hoeing
John Westley
Rev. John Westley( 1636 – 78) was an English nonconformist minister.
He was the grandfather of John Wesley( founder of Methodism).
Fred Le Deux
Frederick" Fred" Le Deux( born 4 December 1934) was an Australian rules footballer who played with Geelong in the Victorian Football League( VFL).
He is the grandfather of Tom Hawkins.
Zhao Shoushan
Zhao Shoushan( 12 November 1894 – 20 June 1965) was a KMT general and later Chinese Communist Party politician.
He is the grandfather of Zhao Leji.
Kaya Alp
Kaya Alp was, according to Ottoman tradition, the son of Kızıl Buğa and the father of Suleyman Shah, who was, in turn, the grandfather of Ertuğrul, and the great grandfather of the Ottoman Empire founder, Osman I.
John Mackay (poet)
John Mackay( 1656–1754), known as( The Blind Piper), was a Scottish Gaelic poet and composer, and the grandfather of William Ross.

Question: Who is Peter Tempesta's maternal grandfather?
Answer: Stephen V of Hungary