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 to leave their homes and flee to the west of the Euphrates. They were recalled to a more courageous frame of mind by the letters of Jacob. In 519, at the age of 68, Jacob was made bishop of Baṭnān, another town in the district of Sĕrūgh, but only lived till November 521.

From the various extant accounts of Jacob’s life and from the number of his known works, we gather that his literary activity was unceasing. According to Barhebraeus (Chron. Eccles. i. 191) he employed 70 amanuenses and wrote in all 760 metrical homilies, besides expositions, letters and hymns of different sorts. Of his merits as a writer and poet we are now well able to judge from P. Bedjan’s excellent edition of selected metrical homilies, of which four volumes have already appeared (Paris 1905–1908), containing 146 pieces. They are written throughout in dodecasyllabic metre, and those published deal mainly with biblical themes, though there are also poems on such subjects as the deaths of Christian martyrs, the fall of the idols, the council of Nicaea, &c. Of Jacob’s prose works, which are not nearly so numerous, the most interesting are his letters, which throw light upon some of the events of his time and reveal his attachment to the Monophysite doctrine which was then struggling for supremacy in the Syrian churches, and particularly at Edessa, over the opposite teaching of Nestorius.

JACOBA, or (1401–1436), countess of Holland, was the only daughter and heiress of William, duke of Bavaria and count of Holland, Zeeland and Hainaut. She was married as a child to John, duke of Touraine, second son of Charles VI., king of France, who on the death of his elder brother Louis became dauphin. John of Touraine died in April 1417, and two months afterwards Jacoba lost her father. Acknowledged as sovereign in Holland and Zeeland, Jacoba was opposed by her uncle John of Bavaria, bishop of Liége. She had the support of the Hook faction in Holland. Meanwhile she had been married in 1418 by her uncle, John the Fearless, duke of Burgundy, to her cousin John IV., duke of Brabant. By the mediation of John the Fearless, a treaty of partition was concluded in 1419 between Jacoba and John of Bavaria; but it was merely a truce, and the contest between uncle and niece soon began again and continued with varying success. In 1420 Jacoba fled to England; and there, declaring that her marriage with John of Brabant was illegal, she contracted a marriage with Humphrey, duke of Gloucester, in 1422. Two years later Jacoba, with Humphrey, invaded Holland, where she was now opposed by her former husband, John of Brabant, John of Bavaria having died of poison. In 1425 Humphrey deserted his wife, who found herself obliged to seek refuge with her cousin, Philip V., duke of Burgundy, to whom she had to submit, and she was imprisoned in the castle of Ghent. John of Brabant now mortgaged the two counties of Holland and Zeeland to Philip, who assumed their protectorate. Jacoba, however, escaped from prison in disguise, and for three years struggled gallantly to maintain herself in Holland against the united efforts of Philip of Burgundy and John of Brabant, and met at first with success. The death of the weak John of Brabant (April 1427) freed the countess from her quondam husband; but nevertheless the pope pronounced Jacoba’s marriage with Humphrey illegal, and Philip, putting out his full strength, broke down all opposition. By a treaty, made in July 1428, Jacoba was left nominally countess, but Philip was to administer the government of Holland, Zeeland and Hainaut, and was declared heir in case Jacoba should die without children. Two years later Philip mortgaged Holland and Zeeland to the Borselen family, of which Francis, lord of Borselen, was the head. Jacoba now made her last effort. In 1432 she secretly married Francis of Borselen, and endeavoured to foment a rising in Holland against the Burgundian rule. Philip invaded the country, however, and threw Borselen into prison. Only on condition that Jacoba abdicated her three countships in his favour would he allow her liberty and recognize her marriage with Borselen. She submitted in April 1432, retained her title of duchess in Bavaria, and lived on her husband’s estates in retirement. She died on the 9th of October 1436, leaving no children.

—F. von Löher, Jakobäa von Bayern und ihre Zeit (2 vols., Nördlingen, 1862–1869); W. J. F. Nuyens, Jacoba van Beieren ''en de eerste helft der XV. eeuw'' (Haarlem, 1873); A. von Overstraten, Jacoba van Beieren (Amsterdam, 1790).

JACOBABAD, a town of British India, the administrative headquarters of the Upper Sind frontier district in Bombay; with a station on the Quetta branch of the North-Western railway, 37 m. from the junction at Ruk, on the main line. Pop. (1901), 10,787. It is famous as having consistently the highest temperature in India. During the month of June the thermometer ranges between 120° and 127° F. The town was founded on the site of the village of Khangarh in 1847 by General John Jacob, for many years commandant of the Sind Horse, who died here in 1858. It has cantonments for a cavalry regiment, with accommodation for caravans from Central Asia. It is watered by two canals. An annual horse show is held in January.

JACOBEAN STYLE, the name given to the second phase of the early Renaissance architecture in England, following the Elizabethan style. Although the term is generally employed of the style which prevailed in England during the first quarter of the 17th century, its peculiar decadent detail will be found nearly twenty years earlier at Wollaton Hall, Nottinghamshire, and in Oxford and Cambridge examples exist up to 1660, notwithstanding the introduction of the purer Italian style by Inigo Jones in 1619 at Whitehall. Already during Queen Elizabeth’s reign reproductions of the classic orders had found their way into English architecture, based frequently upon John Shute’s The First and Chief Grounds of Architecture, published in 1563, with two other editions in 1579 and 1584. In 1577, three years before the commencement of Wollaton Hall, a copybook of the orders was brought out in Antwerp by Jan Vredeman de Vries. Though nominally based on the description of the orders by Vitruvius, the author indulged freely not only in his rendering of them, but in suggestions of his own, showing how the orders might be employed in various buildings. Those suggestions were of a most decadent type, so that even the author deemed it advisable to publish a letter from a canon of the Church, stating that there was nothing in his architectural designs which was contrary to religion. It is to publications of this kind that Jacobean architecture owes the perversion of its forms and the introduction of strap work and pierced crestings, which appear for the first time at Wollaton (1580); at Bramshill, Hampshire (1607–1612), and in Holland House, Kensington (1624), it receives its fullest development.

JACOBI, FRIEDRICH HEINRICH (1743–1819), German philosopher, was born at Düsseldorf on the 25th of January 1743. The second son of a wealthy sugar merchant near Düsseldorf, he was educated for a commercial career. Of a retiring, meditative disposition, Jacobi associated himself at Geneva mainly with the literary and scientific circle of which the most prominent member was Lesage. He studied closely the works of Charles Bonnet, and the political ideas of Rousseau and Voltaire. In 1763 he was called back to Düsseldorf, and in the following year he married and took over the management of his father’s business. After a short period he gave up his commercial career, and in 1770 became a member of the council for the duchies of Jülich and Berg, in which capacity he distinguished himself by his ability in financial affairs, and his zeal in social reform. Jacobi kept up his interest in literary and philosophic matters by an extensive correspondence, and his mansion at Pempelfort, near Düsseldorf, was the centre of a distinguished literary circle. With C. M. Wieland he helped to found a new literary journal. Der Teutsche Mercur, in which some of his earliest writings, mainly on practical or economic subjects, were published. Here too appeared in part the first of his philosophic works, Edward Allwills Briefsammlung (1776), a combination of romance and speculation. This was followed in 1779 by Woldemar, a philosophic novel, of very imperfect structure, but full of genial