Title: Ariarathes V of Cappadocia
Content:  Ariarathes V Eusebes Philopator (reigned 163–130 BC) was a son of the preceding king Ariarathes IV of Cappadocia and queen Antiochis. He was distinguished by his contemporaries for his excellence of his character and his cultivation of philosophy and the liberal arts and is considered by some historians to have been the greatest of the kings of Cappadocia.
Title: Ariarathes V of Cappadocia
Content:  Ariarathes V was the son of the king Ariarathes IV of Cappadocia, and a noble Seleucid Greek woman, Antiochis, who was the daughter of the Seleucid King Antiochus III. According to Livy, he was educated in Rome; but this account may perhaps refer to another Ariarathes. Rather, Ariarathes Eusebes probably spent his youth studying in Athens, where he seems to have become a friend of the future king of Pergamon, Attalus II Philadelphus.
Title: Ariarathes VIII of Cappadocia
Content:  Ariarathes VIII Epiphanes (, Ariaráthēs Epiphanḗs; reigned c. 101–c. 96 BC and in 95), King of Cappadocia, was the second son of Ariarathes VI of Cappadocia and wife Laodice of Cappadocia. Ariarathes VIII had an older sister called Nysa and an older brother called Ariarathes VII of Cappadocia. Ariarathes ascended to the throne when the Cappadocian nobleman rebelled against his maternal uncle, King Mithridates VI of Pontus and his son, the puppet King Ariarathes IX of Cappadocia. He was speedily driven out of the kingdom by Mithridates VI, and shortly afterwards died a natural death. The death of both sons of Ariarathes VI meant that the Cappadocian royal family was extinct. So Mithridates VI placed upon the Cappadocian throne his own son Ariarathes IX, who was only eight years old. However, King Nicomedes III of Bithynia sent an embassy to Rome to 
Title: Ariarathes IX of Cappadocia
Content:  Ariarathes IX Eusebes Philopator (, Ariaráthēs Eusebḗs Philopátōr; reigned c. 100–85 BC), was made king of Cappadocia by his father King Mithridates VI of Pontus after the assassination of Ariarathes VII of Cappadocia in c. 100 BC. Since he was only eight years old, he was put under the regency of the Cappadocian Gordius. Early in his reign Cappadocian nobility quickly drove him from power in favor of a son of Ariarathes VI of Cappadocia, named Ariarathes VIII of Cappadocia. In 95 BC Mithridates VI of Pontus entered Cappadocia with an army deposing Ariarathes VIII of Cappadocia and restoring his son to 
Title: Cappadocian Greeks
Content:  reign Greek towns were beginning to appear in the southern regions of Cappadocia. Ariarathes V of Cappadocia who reigned from 163 to 130 BC is considered to have been the greatest of the Kings of Cappadocia. He was predominantly Greek by descent, his father Ariarathes IV of Cappadocia was half Greek Macedonian and Persian and his mother was Antiochis, was the daughter of the Seleucid Greek King Antiochus III of the Seleucid dynasty. By the 1st century BC, regions of Cappadocia had been ravaged by Armenian King Tigranes the Great, who had relocated a great number of Cilician and Cappadocian Greeks to Mesopotamia (geographically in modern Iraq, eastern Syria and south-eastern Turkey.)
Title: Ariarathes VII of Cappadocia
Content:  Ariarathes VII Philometor ("mother-loving") (, Ariaráthēs Philomḗtōr; reigned in 116&ndash;101 BC or 111&ndash;100 BC), King of Cappadocia, was the first son of King Ariarathes VI of Cappadocia and his wife Laodice of Cappadocia. Ariarathes VII had an older sister called Nysa and a younger brother called Ariarathes VIII of Cappadocia. In his first years he reigned under the regency of his mother Laodice, the eldest sister of the King Mithridates VI of Pontus. During this period the kingdom was seized by King Nicomedes III of Bithynia, who married Nysa. Nicomedes III was soon expelled by Mithridates VI, who restored upon the throne Ariarathes VII. However, Ariarathes VII objected to his father's assassin, and ally of Mithridates VI, Gordius, having a role in the government of Cappadocia. So Mithridates VI had Ariarathes VII killed in 101 BC. Mithridates VI then put onto the Cappadocian throne his own 9 year old son, Ariarathes IX of Cappadocia, with Gordius as the regent for the young king.
Title: Ariarathes III of Cappadocia
Content:   Ariarathes III (, Ariaráthēs; reigned 262 or 255 – 220 BC), son of Ariaramnes, ruler of Cappadocia, and grandson of Ariarathes II, married Stratonice, a daughter of Antiochus II, king of the Seleucid Empire and wife Laodice I, and obtained a share in the government during the lifetime of his father. About 250 BC he was the first ruler of Cappadocia to proclaim himself king (basileus). It is known that he sided with Antiochus Hierax in his war against Seleucus II Callinicus. Ariarathes is also said to have expanded his kingdom adding Cataonia to his dominions. By his marriage he was the father of Ariarathes IV.
Title: Ariarathes II of Cappadocia
Content:  Ariarathes II (, Ariaráthēs; ruled 301–280 BC), satrap and king of Cappadocia, son of Holophernes, fled into Armenia after the death of his uncle and adopted father Ariarathes I, ruler of Cappadocia. After the death of Eumenes he recovered Cappadocia with the assistance of Ardoates, the Armenian king, and killed Amyntas, the Macedonian satrap, in 301 BC, but was forced to accept Seleucid suzerainty. He was succeeded by Ariaramnes, the eldest of his three sons.
Title: Ariarathes VI of Cappadocia
Content:  Ariarathes VI Epiphanes Philopator, was the Ariarathid king of Cappadocia from 130 BC to 116 BC. He was the youngest son of Ariarathes V of Cappadocia and Nysa of Cappadocia.
Title: Ariarathes X of Cappadocia
Content:  Ariarathes X, surnamed Eusebes Philadelphos, "Pious, brother-loving" (, Ariaráthēs Eusebḗs Philádelphos), was the king of Cappadocia from c. 42 BC to 36 BC. He was of Persian and Greek ancestry. His father was King Ariobarzanes II of Cappadocia and his mother was Queen Athenais. He became king after his brother Ariobarzanes III Philoromaios was killed. His rule did not last long as Mark Antony of Rome removed and executed him, replacing him with Sisines, who became Archelaus of Cappadocia.

Question: Who is the father of Ariarathes V of Cappadocia?
Answer: Ariarathes IV of Cappadocia.