Rockwall

Rockwall, a N. E. county of Texas, watered by affluents of Trinity and Sabine rivers, formed since the census of 1870. It consists chiefly of undulating prairies, and has a good soil. Capital, Rockwall.

Roderic

Roderic, the last Visigothic king of Spain, a son of Theodefred, duke of Cordova, fell in battle about the close of July, 711. He became king about 709, after driving Witiza from the throne. The sons of the latter and their uncle Orpas, archbishop of Seville, invoked against Roderic the assistance of the Arabs, who gained possession of Ceuta through the treachery of Count Julian, governor of Andalusia. Roderic roused the people to arms. His forces were vastly superior in number to those of the invaders under Tarik; but in the battle of Jerez de la Frontera, which is said to have lasted eight days, he was betrayed by the sons of Witiza, whom he had placed in command of the wings, and perished on the field.

Rodrigo De Cota

Rodrigo De Cota, a Spanish poet, born at Toledo, died in 1470. He was the supposed author of the first and longest act of the Ce-lestina, a dramatic story in 21 acts or parts, originally called the "Tragi-comedy of Calisto and Melibcea." He was also supposed to have written the celebrated eclogue, Mingo Revulgo, a spirited satire against the latter part of the reign of Henry IV. of Castile; and the "Dialogue between Love and an Old Man" is attributed to him.

Roermond

Roermond (Fr. Ruremonde), a town of the Netherlands, in the province of Limburg, at the junction of the Maas and Roer, 27 m. N. N. E. of Maestricht; pop. about 9,000. It is the seat of a bishop, and contains a handsome cathedral of the middle ages and a parochial church with fine works of art. Its manufactures include woollens, cotton, and paper, and a considerable trade is carried on. The town has been frequently taken in various wars.

Roeskilde

See RÖskilde.

Rogation Days

Rogation Days (Lat. rogare, to ask), in the Roman Catholic ecclesiastical calendar, the three days immediately preceding Ascension day, when public litanies or supplications are made for a blessing on the fruits of the earth. The custom of assembling in public to recite litanies or solemn supplications existed in the primitive church; but Mamertus, bishop of Vienne (died about 474), was chiefly instrumental in fixing for this purpose the three days before Ascension, and in giving them an unusual degree of solemnity. They were thenceforward called litanioe majores, the great litanies, were accompanied with solemn processions, and were held throughout the Latin church. A remnant of this custom in the cities and towns of England consists in the parochial clergy's visiting some part of the parish boundaries accompanied by the church wardens and people.

Roger Cotes

Roger Cotes, an English mathematician, born at Burbage, Leicestershire, July 10, 1682, died in Cambridge, June 5, 1716. He was educated at Cambridge, and in 1706 was made Plumran professor of astronomy, upon the establishment of the chair. In 1713 he took orders, and edited the second edition of Newton's Principia, with a preface treating of gravitation and the objections to it; other works of his were an account of the great meteor of 1715, and his Harmonia Mensurarum, which was the earliest work of importance on the application of logarithms and of the properties of the circle to the calculus of fluents.