Kiril, Prince of Preslav
Prince Kyril of Bulgaria, Prince of Preslav (Kyril Heinrich Franz Ludwig Anton Karl Philipp; 17 November 1895 – 1 February 1945) was the second son of Ferdinand I of Bulgaria and his first wife Marie Louise of Bourbon-Parma.
He was a younger brother of Boris III of Bulgaria and a prince regent of the Kingdom of Bulgaria from 1943 to 1944.
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
Helena of Bulgaria, Empress of Serbia
Helena of Bulgaria, Empress of Serbia (c. 1315–1374) was a Bulgarian princess, the daughter of Sratsimir of Kran and Keratsa Petritsa and the sister of tsar (emperor)
Ivan Alexander of Bulgaria, who married Serbian King and later Emperor Stefan Dušan (r. 1331–55).
Stefan Dušan was crowned King of Serbia at Svrčin on 8 September 1331
(Nativity of the Theotokos).
A year later, most likely 26 April 1332 (Thomas Sunday), Dušan married Helena.
Previously, it was erroneously assumed that the marriage took place on Easter (19 April), however, marriages are not instituted on Easter in the Orthodox Church.
Their wedding night was held at the royal court in Skopje.
The marriage was arranged as part of the peace agreement between Bulgaria and Serbia.
This marriage provided one son, Stefan Uroš V, and possibly one daughter, Irina.
According to John V. A. Fine, she is the same "Irene" who was wife of Gregorios Preljub, the Serbian governor of Thessaly who died in late 1355 or early 1356.
They were parents to Thomas II Preljubović, Ruler of Epirus from 1367 to 1384.
Irene married secondly to Radoslav Hlapen, lord of Kastoria and Edessa.
Helena lived in the Republic of Venice in 1350 and was a regent of Serbia between 1355 and 1356 for her son.
On her husband's death, Helena inherited part of Bulgarian lands between the lower Vardar and the Mesta.
She also received the Chalcidic peninsula, basing her court at Serres.
In 1359 Helena became a nun under the monastic name "Jelisaveta" .
However, she continued to play an active role in politics, governing the region of Serres until 1365.
After that, she retired from political life, overseeing reconstruction and renovation of several monastic communities, until her death in 1374.
Keratsa of Bulgaria
Keratsa-Maria of Bulgaria( 1348–1390) was Princess of Bulgaria during the Second Bulgarian Empire and Empress of Byzantine Empire.
She was the daughter of Tsar Ivan Alexander of Bulgaria and his second wife, a converted Jew, Theodora.
Lyon Cohen
Lyon Cohen( 1868–1937) was a Polish- born Canadian businessman and a philanthropist.
He was the grandfather of singer/ poet Leonard Cohen.
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.
Ana-Neda
Ana- Neda( Bulgarian and; fl. 1323- 1324) was the Empress consort of Bulgaria briefly in 1323- 1324 as the spouse of" Despot of Vidin" Michael Shishman who was elected as Emperor of Bulgaria in 1323.
She was the daughter of Serbian King Stefan Uroš II Milutin and Princess Ana Terter, daughter of George I of Bulgaria.
From the marriage with Michael, they had three sons, one of whom was Ivan Stephen of Bulgaria, later briefly the Emperor of Bulgaria( 1330 – 1331).
Abd al-Muttalib
Abd al- Muttalib Shaybah ibn Hashim( c. 497 – 578) was the grandfather of Islamic prophet Muhammad.
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.
Keratsa Petritsa
Keratsa Petritsa  was a Bulgarian noblewoman ("bolyarka"), sister of tsar Michael Shishman of Bulgaria.
Her eldest son Ivan Alexander rose to the Bulgarian throne after vicissitudes of politics.
Keratsa descended, via a lateral line, from Ivan Asen II.
She was the sister of Michael III Shishman Asen and Belaur, children of "despotēs" Shishman of Vidin by an unnamed daughter of sebastokrator Peter and Anna (Theodora).
She was also a distant cousin of tsar Theodore Svetoslav and tsar George II Terter.
She was Catholic.
Since the middle of the 13th century, the area of Vidin had been effectively autonomous under ineffective Bulgarian overlordship, and was ruled successively by Yakov Svetoslav
(died 1276), Shishman (died between 1308 and 1313), and then the future Michael Asen III.
Shishman and his son received the high courtly title of despotēs from their cousin Theodore Svetoslav and, on the childless death of young George Terter II in 1323, the brother of Keratsa Petritsa was elected emperor of Bulgaria by the nobility.
Keratsa Petritsa converted from Catholicism to Orthodoxy at some point, and retired to a convent under the monastic name Theophana (Теофана).
Her memory is honored in the Bulgarian Orthodox "Synodic" (Синодик):

Question: Who is Helena Of Bulgaria, Empress Of Serbia's maternal grandfather?