user: Who directed the episode of Game of Thrones where Jon Snow and Tormund Giantsbane go to ask the wildlings to settle beyond the Wall, but end up encountering White Walkers and the Night King?

assistant: Season five, episode eight entitled "Hardhome"

user: Name a battlefield surgeon

assistant: <think>
Princess Vera Ignatievna Gedroits was a Russian doctor of medicine and author. She was the first woman military surgeon in Russia, the first woman professor of surgery, and the first woman to serve as a physician to the Imperial Court of Russia. Following her involvement in a student movement, Gedroits was unable to complete her studies in Russia, and despite being openly lesbian, entered into a marriage of convenience, which allowed her to obtain a passport in another name and leave the country. In Switzerland, she enrolled in the medical courses of César Roux and graduated in 1898, working as Roux’s assistant, but returned to Russia because of illnesses in her family. As a young physician, Gedroits was concerned at the low standards of hygiene, nutrition and sanitation, and made recommendations to improve conditions. In the Russo-Japanese War, she performed abdominal surgeries against established policy, leading to a change in the way battlefield medicine was performed. Much decorated for her war service, she served as physician to the royal court until the outbreak of World War I, training the Tsarina Alexandra and her daughters as nurses. At the beginning of the Revolution, Gedroits returned to the battle front. Wounded, she was evacuated to Kiev, where she resumed her work as a physician and academic. In 1921, she was hired to teach pediatric surgery at the Kiev Medical Institute and within two years was appointed a professor of medicine. Soviet purges at that time removed her from office in 1930 and denied her a pension. Gedroits turned her attention to writing autobiographical novels until her death from uterine cancer in 1932.</think>
Vera Gedroits was a ground-breaking physician and surgeon who improved surgical practices on the battlefield and became the first woman to serve as a physician to the Imperial Court of Russia.

user: Who built Sigiriya fortress in Sri Lanka?

assistant: <think>
It is likely that the area around Sigiriya may have been inhabited since prehistoric times. There is clear evidence that the many rock shelters and caves in the vicinity were occupied by Buddhist monks and ascetics from as early as the 3rd century BC. The earliest evidence of human habitation at Sigiriya is the Aligala rock shelter to the east of Sigiriya rock, indicating that the area was occupied nearly five thousand years ago during the Mesolithic Period.

Buddhist monastic settlements were established during the 3rd century BC in the western and northern slopes of the boulder-strewn hills surrounding the Sigiriya rock. Several rock shelters or caves were created during this period. These shelters were made under large boulders, with carved drip ledges around the cave mouths. Rock inscriptions are carved near the drip ledges on many of the shelters, recording the donation of the shelters to the Buddhist monastic order as residences. These were made in the period between the 3rd century BCE and the 1st century AD.

In 477 AD, Kashyapa I, the king’s son by a non-royal consort, seized the throne from King Dhatusena, following a coup assisted by Migara, the King’s nephew and army commander. The rightful heir, Moggallana, fearing for his life, fled to South India. Afraid of an attack by Moggallana, Kashyapa moved the capital and his residence from the traditional capital of Anuradhapura to the more secure Sigiriya. During King Kashyapa’s reign (477 to 495 AD), Sigiriya was developed into a complex city and fortress. Most of the elaborate constructions on the rock summit and around it, including defensive structures, palaces, and gardens, date from this period.</think>
King Kashyapa developed Sigiriya city and fortress.