The building of Amritsar and Tarn Taran was done by named Sikhs whose names survive because Guru Arjan Dev Ji recorded who did the work.
Bhai Behlo of Phaphre in the Malwa carried brick and mortar for the tank at Amritsar and is remembered in the phrase Behlo sabh ton pehlo, Behlo before all. Bhai Salho supervised the works. Bhai Bhagatu of the Malwa was a preacher of the same period whose descendants held the dera at Bhagta Bhai Ka.
Bhai Langah and Bhai Bhagirath were among the early sangat leaders in the Majha and the Malwa, and Bhai Praga was a soldier of Guru Hargobind Sahib Ji's period.
These are not famous names outside the tradition and inside it they are attached to specific villages, which is why a great many Punjab villages have a gurdwara commemorating a man nobody outside the district has heard of.
The pattern is worth stating: the early Panth was organised through named individuals in named villages, and most of those villages still know the name and nothing else.
They are among the Sikhs named in the early tradition as having served the Gurus in specific ways, and each has a village and a shrine attached to his name.
Bhai Behlo is associated with the construction work at Amritsar and Tarn Taran, and the phrase about him in the tradition is that he was made first among the devoted.
Bhai Bhagatu's line in the Malwa established a dera and a following. These figures are the connective tissue of the early community and almost nothing is written about any of them.