Question: Who established the close connection between electricity and magnetism?

Disambiguated questions and answers:
context: Henry Elles was one of the first people to suggest links between electricity and magnetism. In 1757 he claimed that he had written to the Royal Society in 1755 about the links between electricity and magnetism, asserting that "there are some things in the power of magnetism very similar to those of electricity" but he did "not by any means think them the same". In 1760 he similarly claimed that in 1750 he had been the first "to think how the electric fire may be the cause of thunder". Among the more important of the electrical research and experiments during this period were those of Franz Aepinus, a noted German scholar (1724–1802) and Henry Cavendish of London, England.
question: Who was the first person to suggest a close connection between electricity and magnetism?
short_answers: Henry Elles
wikipage: History of electromagnetic theory

context: No context provided
question: Who discovered the close connection between electricity and magnetism through experiments on electromagnetic induction?
short_answers: Michael Faraday

Joseph Henry

context: In 1864 James Clerk Maxwell of Edinburgh announced his electromagnetic theory of light, which was perhaps the greatest single step in the world's knowledge of electricity. Maxwell had studied and commented on the field of electricity and magnetism as early as 1855/6 when "On Faraday's lines of force" was read to the Cambridge Philosophical Society. The paper presented a simplified model of Faraday's work, and how the two phenomena were related. He reduced all of the current knowledge into a linked set of differential equations with 20 equations in 20 variables. This work was later published as "On Physical Lines of Force" in March 1861. In order to determine the force which is acting on any part of the machine we must find its momentum, and then calculate the rate at which this momentum is being changed. This rate of change will give us the force. The method of calculation which it is necessary to employ was first given by Lagrange, and afterwards developed, with some modifications, by Hamilton's equations. It is usually referred to as Hamilton's principle; when the equations in the original form are used they are known as Lagrange's equations. Now Maxwell logically showed how these methods of calculation could be applied to the electro-magnetic field. The energy of a dynamical system is partly kinetic, partly potential. Maxwell supposes that the magnetic energy of the field is kinetic energy, the electric energy potential.
question: Who established equations that predicted the connections between electricity and magnetism?
short_answers: Maxwell

James Clerk Maxwell
wikipage: History of electromagnetic theory

Long answers:
long_answer: Three were several who established the close connection between electricity and magnetism. The first person to suggest it was Henry Elles, while Michael Faraday and Joseph Henry discovered it through experiments on electromagnetic induction. James Clerk Maxwell established equations that predicted the connections between electricity and magnetism.