Romanticism (or the Romantic era/Period) was an artistic, literary, and intellectual movement that originated in Europe toward the end of the 18th century and in most areas was at its peak in the approximate period from 1800 to 1840. Partly a reaction to the Industrial Revolution, it was also a revolt against aristocratic social and political norms of the Age of Enlightenment and a reaction against the scientific rationalization of nature. It was embodied most strongly in the visual arts, music, and literature, but had a major impact on historiography, education and the natural sciences. Its effect on politics was considerable, and complex; while for much of the peak Romantic period it was associated with liberalism and radicalism, in the long term its effect on the growth of nationalism was probably more significant.

The movement validated strong emotion as an authentic source of aesthetic experience, placing new emphasis on such emotions as apprehension, horror and terror, and awe—especially that which is experienced in confronting the sublimity of untamed nature and its picturesque qualities, both new aesthetic categories. It elevated folk art and ancient custom to something noble, made spontaneity a desirable characteristic (as in the musical impromptu), and argued for a "natural" epistemology of human activities as conditioned by nature in the form of language and customary usage. Romanticism reached beyond the rational and Classicist ideal models to elevate a revived medievalism and elements of art and narrative perceived to be authentically medieval in an attempt to escape the confines of population growth, urban sprawl, and industrialism, and it also attempted to embrace the exotic, unfamiliar, and distant in modes more authentic than Rococo chinoiserie, harnessing the power of the imagination to envision and to escape.

Sir Isaiah Berlin OM, FBA (6 June 1909 – 5 November 1997) was a British social and political theorist, philosopher and historian of ideas of Russian-Jewish origin, thought by many to be the dominant scholar of his generation. He excelled as an essayist, conversationalist and raconteur; and as a brilliant lecturer who improvised, rapidly and spontaneously, richly allusive and coherently structured material. He translated works by Ivan Turgenev from Russian into English and, during the war, worked for the British Diplomatic Service. In its obituary of the scholar, The Independent stated that "Isaiah Berlin was often described, especially in his old age, by means of superlatives: the world's greatest talker, the century's most inspired reader, one of the finest minds of our time ... there is no doubt that he showed in more than one direction the unexpectedly large possibilities open to us at the top end of the range of human potential".

In 1932, at the age of 23, he was elected to a prize fellowship at All Souls College, Oxford. From 1957 to 1967, he was Chichele Professor of Social and Political Theory at the University of Oxford. He was president of the Aristotelian Society from 1963 to 1964. In 1966, he played a crucial role in founding Wolfson College, Oxford, and became its first President. He was knighted in 1957, and was awarded the Order of Merit in 1971. He was President of the British Academy from 1974 to 1978. He also received the 1979 Jerusalem Prize for his writings on individual freedom. The annual Isaiah Berlin Lectures are held at the Hampstead Synagogue and both Wolfson College and the British Academy each summer. Berlin's work on liberal theory and on value pluralism has had a lasting influence.

Bertrand Arthur William Russell, 3rd Earl Russell, OM, FRS (18 May 1872 – 2 February 1970) was a British philosopher, logician, mathematician, historian, and social critic. At various points in his life he considered himself a liberal, a socialist, and a pacifist, but he also admitted that he had never been any of these in any profound sense. He was born in Monmouthshire, into one of the most prominent aristocratic families in Britain.

Russell led the British "revolt against idealism" in the early 20th century. He is considered one of the founders of analytic philosophy along with his predecessor Gottlob Frege and his friend Ludwig Wittgenstein, and is widely held to be one of the 20th century's premier logicians. He co-authored, with A. N. Whitehead, Principia Mathematica, an attempt to ground mathematics on logic. His philosophical essay "On Denoting" has been considered a "paradigm of philosophy." His work has had a considerable influence on logic, mathematics, set theory, linguistics, computer science (see type theory and type system), and philosophy, especially philosophy of language, epistemology, and metaphysics.