Once the water is gone, click on the gravestone and arrange date (double click pieces to rotate them); 1118.....1136. 1151.....1153. 1185.....1189. 1247.....1250. 1273.....1291.
At fireplace, find the 7 photos. At Last supper, use your torch on the gathering and pick up the green chalice. Find 8 items around the room and place them on the two columns. Place chalice at the lit altar. Hide from falling rocks in the room, again in the next room, and again in a third room, then exit at bottom of room.