Trinity is a sheet weave with some rather unusual properties. It is a 3-1 sheet weave, possessing properties of both the Persian and European weave families. It forms parallelograms instead of rectangles, and the sheets formed have a tendency to curl in on themselves. This weave was developed by Lorenzo, who pioneered it in a shirt made from #10 stainless steel lockwashers, which make a superb example of the weave. You can weave Trinity with anything that will make European 4-1 and a few smaller ring sizes.

The only major problem with learning to weave Trinity is that the weave is very unstable in the beginning phases. Like with the Half-Persians, if you pick up your patch before it's sufficiently large, it may collapse into the weave known as "Bloody Mess". One way to fix this problem is to start your weaving off of a patch of European 4-1; this provides more stability and may make the starting parts easier. Another way is to simply not pick up the weave until you've added several rows on. Depending on your experience weaving, this may or may not be a feasible alternative. At any rate, onwards!

Step 1: Place three closed rings on an open ring and close the open ring. Lay it out as shown. If you're weaving off of a patch of European 4-1, then you will not be able to use the speedweaving techniques described in the first few steps. Instead, make certain that the copper rings on the left in the image each pass through two rings of your Euro 4-1 patch, then add in the other rings.

Step 2: Place two closed rings on an open ring. Pass the open ring through the upper-left closed ring from the previous step. Again, if you are working off of Euro 4-1, then add one copper ring through two of the rings in the Euro 4-1, then add a silver ring through the top two coppers, then put a copper ring on the silver.

Step 3: In this fashion, continue adding rings until you have a sufficiently long chain. For your first patch, you'll probably want to do at least two more iterations of step 2, but not too many more; the longer you leave the chain in this form, the more likely you are to achieve a useless-mess state. Note that the last silver ring added to the chain has only one copper ring on it. This ensures that we have the same number of rings in each row of the weave.

Step 4: Widening the patch. Put a copper ring on a silver ring and pass the silver ring through the bottom-most copper ring in the chain.

Step 5: Put a copper ring on a silver ring; pass the silver ring through the bottom two copper rings in the chain. Step 4 was really a "border" case for widening the chain; if we had made step 4 go through two rings instead of one, then we would be gradually narrowing down our patch into a triangle. Step 5 is the standard step to widen a patch.

Step 6: As in step 5, put a copper ring on a silver ring and pass the silver ring through two copper rings on the chain.

Step 7: Continue to widen the chain in this fashion. When you get to the end, be careful - even now the patch is not completely stable. You'll need to add at least another row before you get a stable patch.

To continue widening your patch, simply repeat steps 4 through 7. Good luck!
Finished Trinity patch: