The Cid, a man not of princely birth, through the exercise of virtues which his time esteemed,--courage and shrewdness,--had won for himself from the Moors an independent principality. Legend will have begun to color and transform his exploits already during his lifetime. Some fifty years later he had become the favorite hero of popular songs. It is probable that these songs (_cantares_) were at first brief tales in rude metrical form; and that the epic poems, dating from about 1200, used them as sources. The earliest poetic monument in Castilian literature which treats of the Cid is called 'The Poem of My Cid.' While based upon history, its material is largely legendary. The date of its composition is doubtful,--probably about 1200. The poem--the beginning is lost--opens with the departure of "My Cid" from Bivar, and describes his Moorish campaigns, culminating with the conquest of Valencia. Two Leonese nobles, the Infantes (Princes) of Carrion, beseech Alfonso to ask for them in marriage the conqueror's daughters. The Cid assents--to his King he would refuse nothing--and the marriages are celebrated in Valencia with due pomp. But the princes are arrant cowards. To escape the gibes of the Cid's companions, after securing rich wedding portions they depart for Carrion. In the oak wood of Carpes they pretend a desire to be left alone with their wives. Despoiling them of their outer garments, with saddle-girth and spurred boot they seek to revenge upon the Cid's daughters the dishonor to which their own base conduct subjected them while at the Cid's court. But time brings a requital. The Infantes, called to account, forfeit property and honor, esteeming themselves fortunate to escape with their lives from the judicial duels. Princes of Navarre and Aragon present themselves as suitors, and in second marriages Dona Elvira and Dona Sola become queens of Spain. The marriages with the Infantes of Carrion are pure invention, intended perhaps to defame the Leonese nobility, these nobles being princes of the blood royal. The second marriages, if we substitute Barcelona for Aragon, are historical. Of the Cid's two daughters, one married Prince Ramiro of Navarre and the other Count Raynard Berenger III. of Barcelona. In 1157 two of the Cid's great-grandchildren, Sancho VI. of Navarre and his sister Dona Blanca, queen of Sancho III. of Castile, sat on Spanish thrones. Through intermarriage the blood of the Cid has passed into the Bourbon and Habsburg lines, and with Eleanor of Castile into the English royal house.