He graduated from Hilleroed in the spring of 1654, and enrolled at the university of Copenhagen on May 6 of the same year. But a terrific outbreak of the plague forced the university to close on May 30, and Kingo returned to his home. The scourge raged for about eight months, carrying away one third of the city's population, and it was winter before Kingo returned to the school and enrolled in the department of theology. The rules of the university required each student, at the beginning of his course, to choose a preceptor, a sort of guardian who should direct his charge in his studies and counsel him in his personal life and conduct. For this very important position Kingo wisely chose one of the most distinguished and respected teachers at the university, Prof. Bartholin, a brother of his former rector. Professor Bartholin was not only a learned man, known for his years of travel and study in foreign parts, but he was also a man of rare personal gifts and sincere piety. In his younger days he had spent four years at the castle of Rosenholm where the godly and scholarly nobleman, Holger Rosenkrans, then gathered groups of young nobles about him for study and meditation. Rosenkrans was a close friend of John Arndt, a leader in the early Pietist movement in Germany, to which the young Bartholin under his influence became deeply attached. Nor had this attachment lessened with the years. And Bartholin's influence upon Kingo was so strong that the latter, when entering upon his own work, lost no time in showing his adherence to the Arndt-Rosenkrans view of Christianity. Meanwhile he applied himself diligently to his work at the university. Like other disciplines the study of theology at that time was affected by a considerable portion of dry-rust. Orthodoxy ruled the cathedra. With that as a weapon, the student must be trained to meet all the wiles of the devil and perversions of the heretics. Its greatest Danish exponent, Jesper Brochman, had just passed to his reward, but his monumental work, _The System of Danish Theology_, remained after him, and continued to serve as an authoritative textbook for many years to come. Though dry and devoted to hairsplitting as orthodoxy no doubt was, it probably was not quite as lifeless as later generations represent it to have been. Kingo is often named "The Singer of Orthodoxy", yet no one can read his soul-stirring hymns with their profound sense of sin and grace without feeling that he, at least, possessed a deeper knowledge of Christianity than a mere dogmatic training could give him. Kingo's last months at the university were disturbed by a new war with Sweden that for a while threatened the independent existence of the country, a threat which was averted only by the ceding of some of its finest provinces. During these stirring events, Kingo had to prepare for his final examinations which he passed with highest honors in the spring of 1658.