Faine I Would, if I could, or Parthenia
for four numbered couples in a square, arranged "improper" (woman on left), facing out of the square.
Reconstructed by Lady Grainne, though some of the words here are by Dafydd Cyhoeddwr.
Music:
Part 1
Verse 1, Part A
1: Lead your partner out of the square a double.
2: Turn around and lead in a double.
3: Change corners:  Everyone will change places by both hands with your corner.
4: Change across: Odds will take hands with their partners, evens will take hands with their opposites - the person of the opposite gender in the other even couple.  Switch places with these people and fall back into the square formation.
Verse 1, Part B
1: Facing outward again, lead the new person you are now next to out a double.
2: Turn around and lead in a double.
3: Change corners (as before).
4: Change across (as before).
Chorus 1, Part A
1: Face into the square (and from now on).  Odd couples double into the square.
2: Odd couples fall back a double with your corners:  Each odd person takes the hand of the person nearest them in the even couples and fall back a double.
3&4: Arm with your opposite: odds will go back into the square and arm with their opposites, who are right there.  At the same time, each even goes behind the odd couple who took them out of the square and arms with the other even
that couple took out of the square.  Everyone falls back into the square formation with the odd-opposite couples on the evens' side of the square, and the even-opposite couples on the odds' side of the square.
Chorus 1, Part B
1: Even "couples" do a double into the square.
2: Even "couples" fall back a double with your corners (as before).
3&4: Arm with your partners, the evens going back into the square, the odds going behind the evens to do this.  Fall back into the square, in your proper places, at the end.
Part 2
Verse 2, Part A
1&2: Side left to your partner.
3: Change corners.
4: Change across.
Verse 2, Part B
1&2: Side with the new person.
3: Change corners.
4: Change across.
Chorus 2, Part A
1&2: Odds cast (and circle their corner): Each odd person casts toward their partner and walks a circle that goes through their corner's spot and then back to their own.  Through this, their corners follow them.
3&4: Odds circle: Each odd couple takes their own corners and forms one four-person circle which walks around in two doubles back to their places.
Chorus 2, Part B
1&2: Evens cast (and circle their corner): Each even person casts toward their partner and walks a circle that goes through their corner's spot and then back to their own.  Through this, their corners follow them.
3&4: Evens circle: Each even couple takes their own corners and forms one four-person circle which walks around in two doubles back to their places.
Part 3
Verse 3, Part A
1&2: Arm left with your partner.
3: Change corners.
4: Change across.
Verse 3, Part B
1&2: Arm right with the new person.
3: Change corners.
4: Change across.
Chorus 3, Part A
1: Odd couples meet and turn back to back.
2&3: Even couples circle to the right (taking hands if this is feasable) around the odd couples.  Do NOT expect to get all the way around them - you are not supposed to!
4: Everyone fall out into the square with their opposites - evens end up on the odd sides of the square, and the odds end up on the even sides.
Chorus 3, Part B
1: Even couples meet and turn back to back.
2&3: Odd couples circle to the right (taking hands if this is feasable) around the even couples.  Again, you should not expect to get all the way around.
4: Everyone will fall out into the square with their partners in their proper places.