Question: Dromton's teacher was the disciple of a man who was one of how many Buddhist Mahasiddhas?

Context articles: Niguma
Nan Huai-Chin
Maha Bodhi Tahtaung
Atiśa
Shavaripa
Nagarjunakonda
Chiba-dera
Vasudhara
Guangxiao Temple (Guangzhou)
Ratnākaraśānti

Niguma is considered one of the most important and influential yoginis and Vajrayana teachers of the 10th or 11th century in India.
 She was a dakini, and one of the two female founders of the Shangpa Kagyu school of Vajrayana Buddhism, along with dakini Sukhasiddhi.
 Her birth name was Shrijnana (or Palgyi Yéshé in Tibetan).
 Like many of the mahasiddhas and Tantric practitioners of the time, Niguma was known by several names both during her lifetime and afterwards.
 She was called Yogini Vimalashri, or Vajradhara Niguma, or Jñana (wisdom) Dakini Adorned with Bone (ornaments), or The Sister referring to her purported relationship to the great Buddhist teacher and adept Naropa.
 She was also sometimes called Nigupta, which is explained by the historical Buddhist scholar Taranatha as follows: "The name Nigu accords with the Indian language, which is Nigupta, and is said to mean 'truly secret' or 'truly hidden.'
 In fact, it is the code-language of the dakinis of timeless awareness."
Nan Huai-Chin () (March 18, 1918 – September 29, 2012) was a spiritual teacher of contemporary China.
 He was the most eminent disciple of the lay Chan Buddhist teacher Yuan Huanxian, and received confirmation of his enlightenment by various masters of the Buddhist traditions.
 He was considered by many to be the major force in the revival of Chinese Buddhism.
 While Nan was regarded by many in China as one of the most influential Chan Buddhist teachers, he was little known outside the Chinese cultural sphere.
 Nan died at the age of 95 on Sept. 29th, 2012 in Suzhou, China.
Maha Bodhi Ta Htaung (Burmese: မဟာဗောဓိတထောင် , lit. '
a thousand great Bo trees') is a famous Buddhist region and monastery located in Monywa Township, Sagaing Region, Myanmar (Burma).
 It is famous for the Giant Standing Buddha statue, the second tallest in the world, and for the Great Atitudes of U Narãda, who built the monastery.
 This "Sāsana" (religious) site contains thousands of Buddha statues beneath thousands of Bo trees, the Giant Reclining Buddha Statue, Aung Sakkyā Stupa, and other large Buddha statues.
 Currently, a Sitting Buddha Statue, which is expected to become the world's largest Sitting Buddha Statue, is in construction.
 Many Buddhist monks can study the Buddhist "Pariyatti" literature at the monastery.
 Moreover, meditation centres or Vipassãnā centres are opened at this monastic site both for monks and laypersons.
Atīśa Dīpaṃkara Śrījñāna (Bengali: অতীশ দীপংকর শ্রীজ্ঞান ; Standard Tibetan: ཇོ་བོ་རྗེ་དཔལ་ལྡན་ཨ་ཏི་ཤ། ; ) (982 - 1054 CE) was a Buddhist Bengali religious leader and master.
 He was one of the major figures in the spread of 11th-century Mahayana and Vajrayana Buddhism in Asia and inspired Buddhist thought from Tibet to Sumatra.
 In 1013 CE, He traveled to the Srivijaya kingdom and stayed there for 12 years and came back to India.
 He is recognised as one of the greatest figures of classical Buddhism, and Atisa's chief disciple Dromtön was the founder of the Kadam School.
 Atisa is also considered to be a key figure in the establishment of the Sarma schools of Tibetan Buddhism.
Śabara in Sanskrit or Shavaripa in Tibetan is Indian Buddhist teacher, one of the eighty-four Mahasiddhas, honored as being among the holders of the distant transmission of Mahamudra.
 He was a student of Nagarjuna and a teacher of Maitripa.
 He is one of the forefathers of the Kagyu lineage of Tibetan Buddhism.
Nagarjunakonda (meaning Nagarjuna Hill) is a historical Buddhist town, now an island located near Nagarjuna Sagar in Guntur district, Andhra Pradesh, India.
 It is 160 km west side of another important historic site Amaravathi.
 It is one of India's richest Buddhist sites, known in the ancient times as Sri Parvata.
 It now lies almost entirely under the Nagarjunasagar Dam.
 It is named after Nagarjuna, a southern Indian master of Mahayana Buddhism who lived in the 2nd century AD, who is believed to have been responsible for the Buddhist activity in the area.
 The site was once the location of many Buddhist universities and monasteries, attracting students from as far as China, Gandhara, Bengal and Sri Lanka.
 The Buddhist archaeological sites there were submerged, and had to later be dug up and transferred to higher land on the hill, which had become an island.
Chiba-dera (千葉寺 , Chiba-dera ) , also known as Senyō-ji (千葉寺 ) , is a Buddhist temple in the city of Chiba, Chiba Prefecture, Japan.
 The temple is located in the central Chūō District in the city of Chiba.
 Chiba-dera is one of many Buddhist temples in the region that, according to tradition, was established by the priest Gyōki (668–749).
 Chiba-dera is a temple of the Shingon Buzan Sect, and is temple number 29 in the Bandō Sanjūsankasho, or the circuit of 33 Buddhist temples in eastern Japan sacred to the Goddess Kannon.
Vasudhārā, whose name means "stream of gems" in Sanskrit, is the Buddhist bodhisattva of wealth, prosperity, and abundance.
 She is popular in many Buddhist countries and is a subject in Buddhist legends and art.
 Originally an Indian bodhisattva, her popularity has spread to southern Buddhist countries.
 Her popularity, however, peaks in Nepal where she has a strong following among the Buddhist Newars of the Kathmandu Valley and is thus a central figure in Newar Buddhism.
 She is named Shiskar Apa in Lahul and Spiti.
 She is related to Hindu great goddess Lakshmi, and her Sanskrit name Vasundhara indicates she is the source of the eight "bountiful Vasus."
 Therefore, according to the epic Mahabharat, she is the bounty that is the waters of the river Ganges—the goddess, Ganga whose origin is the snows of the Himalayas.
Guangxiao Temple is one of the oldest Buddhist temples in Guangzhou, the capital of China's Guangdong Province.
 As the special geographical position, Guangxiao Temple often acted as a stopover point for Asian missionary monks in the past.
 It also played a central role in propagating various elements of Buddhism, including precepts school, Chan (Zen), Shingon Buddhism, and Pure Land.
 In this temple, Huineng, the sixth Chinese patriarch of Chan Buddhism, made his first public Chan lecture and was tonsured, and Amoghavajra, a Shingon Buddhist master, gave his first teaching of esoteric Buddhism.
 Many Buddhist scriptures were also translated here, including those translated by Yijing and the "Shurangama-sūtra" translated by Paramitiin (般剌密諦).
Ratnākaraśānti (also known as Śāntipa) (c. 1000 CE) was one of the eighty-four Buddhist Mahāsiddhas and the chief debate-master at the monastic university of Vikramashila.
 At Vikramashila he was instructed by Nāropa, and taught both Atiśa and Maitrīpa.
 His texts include several influential commentaries to Buddhist tantras, as well as works of philosophy and logic.