Edzard II, Count of East Frisia
Edzard II, Count of East Frisia was count of East Frisia,( 24 June 1532, in Greetsiel – 1 March 1599, in Aurich) and the son of En no II of East Frisia and Anna of Oldenburg.
During his reign, he came into conflict with the city of Emden.
Edzard was a staunch Lutheran while the city of Emden was mostly Calvinistic.
In 1595 Emden revolted and, after an intercession by the Calvinistic Dutch Republic, Edzard was forced to accept a large degree of independence from Emden.
Johan I of East Frisia
Johan I of East Frisia( 1506 – 1572) was a member of the house of Cirksena and a non-reigning Count of East Frisia and later imperial governor of Limburg.
His father, Edzard the Great, had introduced primogeniture in the county of East Frisia, so that his older brother Enno II of East Frisia inherited the county alone and he had to hold back.
Despite his ambitions, he always acknowledged his brother's rights and did not dispute the inheritance.
Unlike his father and his brother, Johan remained a Catholic.
After his father's death, he joined the imperial army.
However, he soon returned to East Frisia and began supporting his brother.
He had, however, little positive impact on his brother, who ruled unwisely.
Johan was unable to distinguish himself, and also took some unwise and ill- advised actions, such as those that lead to the Guelders feud.
He may also have encouraged Enno to try to re-introduce Catholicism in East Frisia.
This attempt was cut short when Enno died in 1540.
Enno's widow, Anna became regent for her son Edzard II.
Johan had an endless series of conflicts with Anna.
In 1538, Johan married Dorothea of Austria, the illegitimate daughter of Emperor Maximilian I. In 1543, Emperor Charles V reminded Johan of the fact that he was still, technically, in the imperial service.
Charles appointed Johan as stadtholder of the Duchy of Limburg, Falkenburg and Dalheim.
From that time onwards, Johan was colloquially called" Count Johan of Falkenburg".
His descendants lived at Coldeborg Castle in the Rheiderland and were financially supported by the counts of East Frisia.
Christian Everhard, Prince of East Frisia
Prince Christian Everhard of East Frisia( 1 October 1665, Esens – 30 June 1708, Aurich) was a Prince of East Frisia from the House of Cirksena from the day he was born in 1665, but remained under guardianship until 1690.
Juliana of Hesse-Darmstadt
Juliana of Hesse-Darmstadt (14 April 1606 in Darmstadt – 15 January 1659 in Osterode am Harz) was the wife of Count Ulrich II of East Frisia and was regent for her minor son Enno Louis from 1648 to 1651.
Her parents were Landgrave Louis V of Hesse-Darmstadt and Magdalene of Brandenburg, daughter of Elector John George von Brandenburg.
Juliana arrived in East Frisia on 5 March 1631 and married count Ulrich II on the same day.
She and her husband had three sons: Enno Louis, George Christian and Edzard Ferdinand.
Even during the turmoil of the Thirty Years' War Ulrich managed to build a Lustschloss for his wife at Sandhorst.
It was completed in 1648 even though East Frisia had to endure great hardship during the war, due to various foreign occupiers.
After her husband's death, she was appointed guardian of her minor sons, and regent of the county.
However, she sent her cumbersome sons abroad and lived a life of decadence, leaving the management of the badly damaged county in the hands of her favourites, who managed the county poorly.
This led to increasing problems with the East Frisian Estates.
Most notable among these favourites were Secret Councillor Johann von Marenholz and his wife Elisabeth von Ungnad zu Sonneck, who a been a lady-in-waiting for Juliana.
Juliana was alleged to have had an affair with Marenholz, which later proved his undoing.
He was executed in Wittmund on 21 July 1651, after a show trial.
In the meantime, Juliana had moved the court from Aurich to Sandhorst to be able to indulge in the sweet life undisturbedly.
Many East Frisians held that under Marenholz and his wife, the problems of the county had gotten out of hand and urged the young Count Enno Louis to return to his County.
Emperor Ferdinand III declared Enno Louis to be an adult in 1651 and in May that year Enno Louis removed his mother from government.
She was sent to her Wittum at Berum Castle.
In 1654 she bought the farm Westerhof in Osterode am Harz, where she died on 15 January 1659.
Ulrich II, Count of East Frisia
Ulrich II of East Frisia, was count of East Frisia,( 6 July 1605 – Aurich, 1 November 1648) was the fifth child and the third son of Enno III, Count of East Frisia and Anna of Holstein- Gottorp.
He inherited the East Frisia after the unexpected death of his brother Rudolf Christian on 17 April 1628.
He reigned during the Thirty Years' War.
East Frisia did not participate in the war, but general Ernst von Mansfeld quartered his troops in East Frisia, causing great distress.
The only exception was Emden because of the recently completed city wall, the city of Emden was protected against foreign troops.
Christine Charlotte of Württemberg
Christine Charlotte of Württemberg( 21 October 1645, Stuttgart – 16 May 1699, Bruchhausen) was a princess consort of East Frisia by marriage to George Christian, Prince of East Frisia.
She served as the regent of East Frisia during the minority of her son from 1665 until 1690.
Enno I, Count of East Frisia
Enno I of East Frisia, count of East Frisia( 1 June 1460 – Friedeburg, 19 February 1491) was the eldest son of Ulrich I of East Frisia and Theda Ukena, of a chiefly East Frisian family.
Enno II, Count of East Frisia
Enno II of East Frisia (1505 - 24 September 1540 in Emden) was the son of Edzard I of East Frisia.
In 1528 he became count of East Frisia.
For most of his life he ruled together with Johan I of East Frisia, who remained Catholic, while Enno was Lutheran.
Enno II lost Jever because he failed to fulfill the marriage obligations his father had arranged for him to Maria of Jever.
Enno and his brother Johan were supposed to marry the heirs of Jever, but Enno broke off the arrangement, which greatly offended Mary of Jever, who as a result became a lifelong enemy of Enno.
She made sure that Jever was given to Oldenburg after her death.
Enno also voluntarily relinquished Butjadingen at his marriage to Anna of Oldenburg (1501–1575).
Only Harlingerland remained, ruled by the aggressive chieftain,
Balthasar Oomkens von Esens.
Enno drove out Balthasar in 1530, but he returned and devastated East Frisia with help from the duke of Guelders.
Enno was forced to recognise Balthasar as Chieftain of Harlingerland.
Enno did not come out well from his feud with Guelders.
Enno played an important role in the attacks on the numerous East Frisian abbeys and monasteries.
He confiscated their possessions to finance his wars.
Enno died at the age of 35, and his wife Anna of Oldenburg became regent for their sons.
Enno Louis, Prince of East Frisia
Enno Louis of East Frisia, was count of East Frisia and after 1654 "Fürst (Prince) of East Frisia", (29 October 1632 – Aurich, 4 April 1660) and the son of Ulrich II and Juliana of Hesse-Darmstadt.
Rudolf Christian, Count of East Frisia
Rudolf Christian of Ostfriesland, Count of East Frisia, was count of East Frisia, (Hage, 2 June 1602 – Hage, 17 April 1628) and the second son of Enno III, Count of East Frisia and Anna of Holstein-Gottorp.
During his reign, foreign troops participating in the Thirty Years' War began retreating into and quartering in East Frisia.
Also during his reign, fen exploitation in East Frisia begins.
He reached a settlement with the East Frisian Estates, who them paid him homage, ultimately even the city of Emden did so.
Under his leadership, the Harlingerland was finally incorporated in the county of East Frisia.
This is visible in the county's coat of arms, which was introduced under his rule in 1625 and remained in use until the county was annexed by Prussia in 1744.
At the age of just 26, he got embroiled in a fight with a lieutenant of the army of general Matthias Gallas, which was quartered in Berum Castle.
He was stabbed in the left eye, and died of his wound.
Since Rudolf Christian was childless, he was succeeded as Count of East Frisia by his brother Ulrich II.

Question: Who is Enno Louis, Prince Of East Frisia's maternal grandmother?