Agis II (Gr. Ἄγις) (died c. 401 BC) was the 17th Eurypontid king of Sparta, the eldest son of Archidamus II by his first wife, and half-brother of Agesilaus II. He ruled with his Agiad co-monarch Pausanias.

Agis succeeded his father Archidamus in 427 BC, and reigned a little more than 28 years. In the summer of 426 BC, he led an army of Peloponnesians and their allies as far as the isthmus, with the intention of invading Attica; but they were deterred from advancing farther by a succession of earthquakes which happened when they had got so far. In the spring of the following year he led an army into Attica, but quit it fifteen days after he had entered it. In 419 BC, the Argives, at the instigation of Alcibiades, attacked Epidaurus; and Agis with the whole force of Lacedaemon set out at the same time and marched to the frontier city, Leuctra. No one, Thucydides tells us, knew the purpose of this expedition. It was probably to make a diversion in favor of Epidaurus.

At Leuctra the unfavorable aspect of the sacrifices deterred him from proceeding. He therefore led his troops back, and sent round notice to the allies to be ready for an expedition at the end of the sacred month of the Carnean festival; and when the Argives repeated their attack on Epidaurus, the Spartans again marched to the frontier town, Caryae, and again turned back, professedly on account of the aspect of the victims. In the middle of the following summer (418 BC) the Epidaurians being still hard pressed by the Argives, the Lacedaemonians with their whole force and some allies, under the command of Agis, invaded Argolis. By a skilful manoeuvre he succeeded in intercepting the Argives, and posted his army advantageously between them and the city. But just as the battle was about to begin, the Argive general Thrasyllus and Alciphron came to Agis and prevailed on him to conclude a truce for four months.

Radu Marian is a Romanian/Moldovan male soprano or sopranist.

Marian possesses a pure soprano voice in the range of C4 to C6, and he is considered an important singer in Baroque music. His repertoire incorporates cantatas written for soprano by composers like Handel, Bononcini, Carissimi, and Frescobaldi, and the repertoire of the old castrati. Marian has been called "the Baroque nightingale" by the renowned Italian newspaper Corriere della Sera.

Marian is an "endocrinological castrato" or "natural castrato". A natural castrato is a singer who never went through puberty and so kept his "unbroken" voice intact.

Marian was born in 1977, in what was then the Moldavian Soviet Socialist Republic, to a family of artists. His talent was first recognized publicly in 1989, at the International Festival of Creation in Moscow, where he took the Laureate prize.

In 1990, at the age of 13, Marian was awarded first prize at the Extraordinary Talents International Festival in Chisinau. Afterwards, his concert career flourished, and he also continued his singing and piano studies in Moscow and in Bucharest.