Dissolve yeast in 1 cup of warm water. In a large mixing bowl, beat margarine until fluffy. Beat eggs in another bowl until light. Add eggs to margarine, blending well. Stir in dissolved yeast water. Sift flour, salt and sugar together. Gradually add to egg mixture, continue to beat until satiny. Cut Swiss and cheddar cheese into 1/4 inch cubes. Stir cubed cheese and Parmesan cheese into mixture. Place dough in a 4 quart greased glass mixing bowl. Cover and let rise until doubled in volume. With spoon, and stir gently. Cover bowl and let rise until doubled, again. Grease a 10-inch tube pan. Gently stir dough down. Pour into pan. Let rise again until doubled. Bake in a preheated 400 degrees oven for 35 – 40 minutes. Cool 10 minutes out of oven. Lift bread out by tube and cool

20 more minutes. Eat while warm or cool.