[1] In 2000 the research group at Oxford University headed by Dr. Agnar Helgason first discovered the haplotype that was much later to become known as Q-L804.
Q-L804 occurred on the Q-L54 lineage roughly 10-15 thousand years ago as the migration into the Americas was underway.
Since the discovery and definition of Q-L804 in 2014, three main subclades of Q-L804 bearing populations have been discovered in North Europe.
Of these three branches Q-JN14 has the widest distribution, ranging from Poland to Iceland, British Isles and France.
The L804 was discovered and defined by Thomas Krahn of Family Tree DNA's Genomics Research Center in 2012.
Current status of the polygenetic tree for Q-L804 is published by Pinotti et al. in the article Y Chromosome Sequences Reveal a Short Beringian Standstill, Rapid Expansion, and early Population structure of Native American Founders.