But the dweller at Tyuonyi had forgotten something. He did not realize how tremendously heavy the roof of his big kiva was. He did not know that the small pine timbers, the splittings, brush, grass, mud and dirt would cause the big pine vigas to bend and sag and crack in the middle. It is a question whether or not the roof fell in during some important ceremony. The situation had to be remedied at any rate. Pine poles, nine or ten inches in diameter were cut so they would support the weight of the roof. Six holes were dug in the kiva floor, two under each of the big vigas. Flat rocks were put in the bottoms of the holes and the ends of the six timbers were inserted and swung into place under the big girders, and driven with heavy rocks into an upright position. The big vigas might have sagged a little but the roof never fell after this time. Flat stones were driven tight around the bottoms of the support posts and the holes in which they rested were packed solid with mud and rocks to keep the timbers from slipping. And this was how the prehistoric Indian at Tyuonyi built his ceremonial chambers in which women were not allowed unless requested by the men. There might have been more than one roof put on this kiva. The first one could have been laid during the latter part of the fifteenth century. It could have fallen and then been rebuilt. Archæologists do know that the last time this large kiva was roofed over was during the early part of the sixteenth century. We found one of the large charred ends of a big roof timber and it had been cut in 1513 A.D. So it was about this time that the last kiva roof was laid. Just how long it was in use is a question. It was surely used until the end of the occupation of Frijoles Canyon sometime near the close of the sixteenth century.