Baron by Foxymoron

 There are several bids in bridge which are often prefaced by the word Baron, in particular the Baron 2S, the Baron 2NT and the Baron 3C, occurring in different auctions. They all originate from the same bidding system, developed in the 1940s by Adam "Plum" Meredith and Leo Baron, the subject of a book I have ordered recently from Amazon. Meredith was a member of the 1955 World Championship winning team, but less is known of Baron.

Leo Solomon Baron (13 October 1916 – 22 October 1985) was a British lawyer, Royal Air Force officer and contract bridge player who practised law in Southern Rhodesia (today Zimbabwe) during the 1950s and 1960s, sat on the Supreme Court of Zambia during the 1970s, and briefly served as Acting Chief Justice of Zimbabwe in 1983.

The principle of the Baron convention is that it generally shows a strong hand, and opener is invited to bid 4 card suits in ascending order. It would have been very useful on a hand today:

We did not explore the hand fully, but avoided the bad 6NT, which does not make. At our table, my partner opened a Precision 1D, and rebid 1NT to show 11-13. My choice was 3NT or 4NT, invitational, and I went tor the former. 

I think South should open a 14-16 NT, and then I could have used a version of the Baron convention on the North hand. The way this is used with my Welsh International partner is that I transfer to hearts on the North hand and then bid 2S, cancelling the transfer and promising 18+ points. Now South will bid a five-card suit if he has one, else he bids 2NT. Then I bid 3D as North, showing 4. Now South can agree diamonds with 4D and North might just bid 6D. He knows the partnership has 33 points or thereabouts and a 4-4 diamond fit. That makes easily enough here, as declarer can cash two top diamonds and three spades, and two ace kings. Now he cross-ruffs the last four tricks and the defence just make a trump.