"Well," began the father, "away back in the times before Christ, a body of rough men came from the northern part of France and the surrounding countries. They were called Celts. They were constantly roving; and so it chanced they came to this very spot where we now are, and founded a village which they called Vindobona. But about fourteen years after Christ, the Romans worked their way northward; they saw the village of the Celts and captured it. They built a great wall about it, placed a moat outside of these fortifications and settled down to retain their conquest. They built a forum, which was a public square where all the business of the city was transacted; and, on one side, they placed their camp or praetorium. To-day, we call the Roman forum the Hohermarkt, just here where we stand now," continued Herr Müller, "and here, where the Greek banker Sina has built this fine palace, stood the Roman praetorium; while here, you see the street is named for Marcus Aurelius, the Roman emperor who was born in Spain and died in this city so many hundreds of years ago." "I've heard that ever so many times, father," said Ferdinand, "but I never realized it before; somehow it seems as if I could almost see the Celts driven out and the great wall and moat of the Romans." Meanwhile they had walked on, down the Bauermarkt and reached the St. Stephanienplatz, with St. Stephan's Church in the middle. "There," said Herr Müller, pointing to the beautiful edifice, "is the oldest monument we have in Vienna, begun in 1144. Duke Heinrich Jasomirgott founded it." [Illustration: ST. STEPHAN'S CHURCH.] "Oh, he was our first duke," spoke up Teresa, who also wished to prove that she knew _her_ Austrian history as well as her friend.