Title: Ballāla Sena
Content:  Vallalasena or Ballala Sena (বল্লাল সেন; reign: 1160–1179), also known as Ballal Sen in vernacular literature, was the second ruler of the Sena dynasty of Bengal region of the Indian subcontinent. He was the son and successor of Vijaya Sena, and ended the Pala Empire by defeating Govindapala. Ballala Sena married Ramadevi a princess of the Western Chalukya Empire which indicates that the Sena rulers maintained close social contact with south India. He is the best-known Sena ruler and consolidated the kingdom. He might have completed the conquest of North Bengal and also conquered Magadha and Mithila. According to a tradition in Bengal, Ballala Sena's kingdom consisted of five provinces, viz., Banga, Barendra, Rar, Bagri (possibly a portion of lower Bengal), Mithila and 
Title: Ballāla Sena
Content:  Sen was descended from the royal family of Bengal, who proceeded to Delhi, and was proclaimed emperor of Hindoostan. But neither the two inscriptions that survive from this region, nor the two great literary works, which were attributed to him, viz., Dan Sagar and Adbhut Sagar, allude to his military victories. On the other hand, these refer to his scholastic activities and social reforms. Ballala Sena is associated with the revival of orthodox Hindu practices in Bengal, in particular with the establishment of the reactionary tradition of Kulinism among Brahmins and Kayasthas. The Brahmins were classified into Kulin, Śrotriya, Vamsaja and Saptasati; the Kayasthas were classified into Kulin and Maulik, but there is no historical authenticity. His marriage to Ramadevi, the Chalukya princess 
Title: Ballāla Sena
Content:  indicates that the Sens maintained the kingdom inherited from his father, which included the present day Bangladesh, the whole of West Bengal and Mithila, i.e., portions of North Bihar. According to a cryptic passage in Adbhuta Sagara, Ballala Sena, along with his queen, retired in his old age to the confluence of the Ganges and the Yamuna leaving his son, Lakshmana Sena, with the task of both maintaining his kingdom and completing his literary work. According to a Sena epigraph, Ballala was an author. He wrote Danasagara in 1168. And in 1169, he started but did not finish writing Adbhutasagara. In Adbhutasagara, it was mentioned that Ballala Sena conquered Mithila while Vijaya Sena was still alive. Besides he introduced the practice of Kulinism.
Title: H. S. Ballal
Content:  Ballal is an ethnic Bunt and hails from the Hebri Beedu family, the chief landowners of Hebri in Udupi district. He is the eldest among five sons of Prafulla and Belinje Sanjiva Hegde. He is married to Indira Ballal and has two children: son Sandeep Ballal and daughter Supriya Shetty. His youngest brother is H. Sudarshan Ballal. Ballal graduated with an MBBS from Mysore Medical College and post graduated with DMRD and MD in radio-diagnosis from Government Medical College, Bangalore.
Title: Sena dynasty
Content:  The Sena dynasty was a Hindu dynasty during the early medieval period on the Indian subcontinent, that ruled from Bengal through the 11th and 12th centuries. The empire at its peak covered much of the north-eastern region of the Indian subcontinent. The rulers of the Sena Dynasty traced their origin to the south Indian region of Karnataka. The dynasty's founder was Samanta Sena. After him came Hemanta Sena who usurped power and styled himself, king, in 1095 AD. His successor Vijaya Sena (ruled from 1096 AD to 1159 AD) helped lay the foundations of the dynasty, and had an unusually long reign of over 60 years. Ballala Sena conquered Gaur from the Pala, became the ruler of the Bengal Delta, and made Nadia the capital as well. Ballala Sena married Ramadevi a princess of the Western Chalukya Empire which indicates that the Sena rulers maintained close social contact with south India. Lakshmana Sena succeeded Ballala Sena in 1179, ruled Bengal for approximately 20 years, and expanded the Sena Empire to Odisha, Bihar and probably to Varanasi. In 1203–1204 AD, Bakhtiyar Khalji, a general under the Delhi Sultanate, attacked and captured the capital City of Nadia.
Title: Ballal Dhipi
Content:  Ballal Dhipi is a historic archeological site on the eastern flood plain of the Hooghly in Nadia, West Bengal, a few kilometres east of Nabadwip. The remains date back to the 12th century AD and earlier. A 30-ft structure of solid terracotta bricks is spread over an area of 1,300 sq ft. with a floor made of lime and sand. It is named after Ballala Sena (1160-1179) of the Sena dynasty. Archaeologists have found traces of a temple complex. Historians differ on the origin of the structure. It may be the ruin of a Buddhist stupa or vihar, possibly built between the 11th and 13th centuries. It has similarities with Vikramshila Vihar, in Bihar and Shompur Vihar, in Rajshahi, Bangladesh. It may also be a part of the capital of the Sena dynasty.
Title: Ashish Ballal
Content:  Ballal hails from the Bunt community and is married to fellow Bunt Sahana. He is a father to two sons, Vansh Ballal and Yash Ballal.
Title: Kumortuli
Content:  went to the village of Langolbond to bathe. On her way back she gave birth to a son, Ballal Sen. Later this prince became king of the Sena dynasty. After ascending to the throne, Ballal Sen built a temple to glorify his birthplace, which is known as Dhakeswari temple, Bangladesh. Ballal Sen proceeded to have vivid dreams, one of which involved the deity Durga. He dreamt that Durga was hidden within the jungle; he proceeded to discover the said deity which was concealed there. In order to celebrate this discovery, he built a temple later named Dhakeswari. This explains the etymological meaning of 
Title: Ballal
Content:  Ballal (also spelt as Ballala) is a surname from coastal Karnataka in India. It is found among Hindu Bunt and Jain Royal communities.
Title: History of Bengal
Content:  resurgence of Hinduism in his kingdom. He married a Western Chalukya princess and concentrated on building his empire eastwards, establishing his rule over nearly all of Bengal and large areas of lower Assam. Ballala Sena made Nabadwip his capital. The fourth Sena king, Lakshmana Sena, son of Ballala Sena, was the greatest king of his line. He expanded the empire beyond Bengal into Bihar, Assam, Odisha and likely Varanasi. Lakshmana was later defeated by the nomadic Turkic Muslims and fled to eastern Bengal, where he ruled few more years. It is proposed by some Bengali authors that Jayadeva, the famous Sanskrit poet and author of Gita Govinda, was one of the Pancharatnas or "five Gems" of the court of Lakshmana Sena.

Question: Who is the father of Ballal Sena?
Answer: Vijay Sena.