Ja'far ibn Aqeel
Ja'far ibn Aqeel was the son of Aqeel ibn Abi Talib, and his mother was Umm- Thaqr as the daughter of Amer — Hesam ibn Ameri—who was from Bani Kilab.
Meanwhile, he was the son -in- law of Ali ibn Abi Talib.
Ja'far is considered as one of Hussain's companions; he entered the battlefield after Abdullah ibn Moslem, and he killed 2( or 15) fighters of the army of Omar Saad.
He was killed by Boshr ibn Hoot Hamdani or Khalid bin Asad al Johani in( the battle of) Karbala on the day of Ashura when he was with Hussain ibn Ali.
Ja'far ibn Aqeel was reciting the following epic verses in the battlefield:
Additionally, the name of Ja'far ibn Aqeel ibn Abi Talib has been mentioned in Ziyarah al- Nahiya al- Muqaddasa and also Ziyarah al- Rajabiyyah.
Abu'l-Abbas ibn al-Furat
Abu'l- Abbas ibn Ja'far ibn al- Furat was the son of the powerful Ikhshidid vizier Ja'far ibn al- Furat.
He was in turn appointed vizier by the Fatimid caliph al- Hakim( r. 996–1021) in 1014/ 5, but executed after a few days.
Ja'far ibn Yahya
Ja'far
ibn Yahya Barmaki, Jafar al-Barmaki
(ja`far bin yaḥyā)
(767–803) was a Persian vizier of the Abbasid caliph Harun al-Rashid, succeeding his father (Yahya ibn Khalid) in that position.
He was a member of the influential Barmakid family, formerly Buddhist leaders of the Nava Vihara monastery.
Along with the rest of the Barmakids, he was executed in 803 at the orders of Harun al-Rashid.
It is said that his execution was for allegedly having had an affair with Harun's sister Abbasa, although historical sources remain unclear.
He had a reputation as a patron of the sciences, and did much to introduce Indian science into Baghdad.
He was credited with convincing the caliph to open a paper mill in Baghdad, the secret of papermaking having been obtained from Tang Chinese prisoners at the Battle of Talas (in present-day Kyrgyzstan) in 751.
Jafar ibn Ali
Ja’far ibn Ali ibn Abi Talib( Arabic: جعفر بن علي بن أبي طالب) was son of Imam Ali and Umm ul- Banin.
He was present with Imam Hussain in( the battle of) Karbala as one of his companions.
Imam Ali named him Jafar because of his great love for Ja'far ibn Abi Talib who was his brother.
Finally, he was martyred on Ashura with his brothers Abbas, Abdullah and Uthman.
Ja'far ibn Dinar al-Khayyat
Ja'far ibn Dinar ibn' Abdallah al- Khayyat was a ninth- century military commander for the Abbasid Caliphate.
Musa ibn Yahya
Mûsâ ibn
Yahy â( Arabic: م وسى بن يحيى, mūsā ben yaḥy ā) was a member of the powerful Barmakids clan, the son of Yahya ibn Khalid and brother of Ja'far ibn Yahya.
He ruled Damascus between 793 and 794.
Awn ibn Ja'far
Awn ibn Ja'far was a companion and relative of the Islamic prophet Muhammad.
He was born in Abyssinia, the third son of Ja'far ibn Abu Talib and Asma bint Umais.
The family returned to Medina in 628.
He married his cousin, Umm Kulthum bint Ali, who was a granddaughter of Muhammad.
They had no children.
Muhammad ibn Ja'far
Muhammad ibn Ja'far( Arabic: محمد بن جعفر) was a companion and relative of the Islamic prophet Muhammad.
He was the son of Muhammad's cousin, Ja'far ibn Abu Talib, and of Asma bint Umais.
His uncle Ali particularly wished that his daughters should marry Ja'far's sons.
In due course, Muhammad ibn Ja'far did marry Ali's daughter Umm Kulthum, who was the widow of his brother Awn.
They had no children.
Ja'far ibn Muhammad al-Hasani
Ja'far ibn Muhammad ibn Husayn al- Hasani was Sharif of Mecca from the late 960s to the early 970s, and the first Emir belonging to the Musawid dynasty.
He was a Hasanid, descendant of the ninth generation from Hasan ibn Ali.
According to Ibn Khaldun, Ja'far came from Medina and conquered Mecca.
He ordered the" khutbah" in the name of the Fatimid caliph al- Mu'izz after the latter conquered Egypt in 969.
Although the date Ja'far conquered Mecca is not known, Ibn Hazm writes that it was during the reign of the Ikhshidids in Egypt.
Al- Fasi narrows it down to the years 356-358 AH( 967 -969), since Ikhshidid influence in the Hejaz waned after the death of Abu al- Misk Kafur.
However, he does acknowledge that this is contradicted by some chronicles which indicate that Ja'far had Kafur's name pronounced in the khutbah.
The sources provide different dates for the year in which Ja'far captured Mecca: the years 967, 968, 969, and the entire period 951–961 are mentioned.
Ja'far founded a long line of Hasanid Sharifs of Mecca, which lasted until their overthrow by the Saudis in 1924.
Ja'afar's line, the Ja'farid dynasty, ended with Shukr ibn Abi'l- Futuh in 1061.
Medina, on the other hand, was frequently controlled by the Husaynids.
Yahya ibn Khalid
Yahya ibn Khalid (died) was a member of the powerful Persian Barmakids family, son of Khalid ibn Barmak.
Around 765, he was appointed to Adharbayjan by the Caliph al-Mansur.
Yahya's son Fadl ibn Yahya was born at Rayy, at the same time as Caliph al-Mahdi's son Harun.
Al-Mahdi entrusted Yahya in 778 with Harun's education.
When al-Hadi was Caliph, Yahya dissuaded the Caliph several times from proclaiming his own son as heir instead of Harun.
He eventually did so, and cast Yahya into jail, but died shortly after.
When Harun became Caliph as Harun al-Rashid, he made Yahya vizier.
Under his influence, the Caliph invited to Baghdad many scholars and masters from India, especially Buddhists.
A catalogue of both Muslim and non-Muslim texts prepared at this time, Kitab al-Fihrist, included a list of Buddhist works.
Among them was an Arabic version of the account of Buddha’s previous lives, Kitab al-Budd.
He had three sons, among which Ja'far succeeded him as vizier, Musa ruled Damascus, and Fadl was governor of Khurasan, then of Egypt.
In 803, his family fell into disgrace, and he was cast into prison, where he died in 806 (according to the story, because his son Ja'far had an affair with Harun al-Rashid's sister, most likely because the family had too much power).

Question: When did Ja'Far Ibn Yahya's father die?