SIDNEY or SYDNEY, ALGERNON, a noted politician and soldier of extreme republican views, second son of Robert, second Earl of Leicester; first came into public notice in 1641-1642 by his gallant conduct as leader of a troop of horse in the Irish Rebellion; came over to England in 1643, joined the Parliamentarians, rose to a colonelcy and command of a regiment in 1645; was subsequently governor of Dublin and of Dover (1647), entered Parliament (1646), and although appointed one of the commissioners to try Charles I., absented himself from the proceedings, but afterwards approved of the execution; withdrew from politics during Cromwell’s Protectorate, but on the reinstating of the Long Parliament (1659) became a member of the Council of State; was on a diplomatic mission to Denmark when the Restoration took place, and till his pardon in 1677 led a wandering life on the Continent; intrigued with Louis XIV. against Charles II., assisted William Penn in drawing up the republican constitution of Pennsylvania, was on trumped-up evidence tried for complicity in the Rye House Plot and summarily sentenced to death by Judge Jeffreys, the injustice of his execution being evidenced by the reversal of his attainder in 1689 (1622-1683).

SIDNEY, SIR PHILIP, poet, and one of the most attractive figures at Elizabeth’s court, born at Penshurst, Kent, the son of Sir Henry Sidney, lord-deputy of Ireland; quitted Oxford in 1572, and in the manner of the time finished his education by a period of Continental travel, from which he returned imbued with the love of Italian literature; took his place at once in the court of Elizabeth, his uncle, the Earl of Leicester, being then high in favour, and received rapid promotion, being sent as ambassador in 1576 to the court of Vienna; nor was his favour with the queen impaired by his bold “Remonstrance” against her marriage with the Duke of Anjou, and in 1583 received a knighthood; two years later, “lest she should lose the jewel of her dominions” the queen forbade him to accompany Drake to the West Indies, and appointed him governor of Flushing, but in the following year he received his death-wound at the battle of Zutphen gallantly leading a troop of Netherlander against the Spaniards; his fame as an author rests securely on his euphuistic prose romance “Arcadia,” his critical treatise “The Defence of Poesy,” and above all on his exquisite sonnet-series “Astrophel and Stella,” in which he sings the story of his hapless love for Penelope Devereux, who married Lord Rich; was the friend of Edmund Spenser, and the centre of an influential literary circle (1554-1586).

SIDON, an ancient Phoenician city on the E. of the Mediterranean, 20 m.  N. of Tyre, with an extensive commerce; was famed for its glass and purple dye; also suffered many a reverse of fortune.

SIEBENGEBIRGE, a range of hills on the right bank of the Rhine, 20 m. above Koeln, distinguished by its seven high peaks.

SIEGFRIED, a hero of various Scandinavian and Teutonic legends, and especially of the “NIBELUNGEN LIED” (q. v.), was rendered invulnerable by bathing in the blood of a dragon which he had slain, except at a spot on his body which had been covered by a falling leaf; he wore a cloak which rendered him invisible, and wielded a miraculous sword named BALMUNG (q. v.).