 Birth | about 1700 Note: In 1777 census he said he was 68 but in 1779 census he was 81.
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 Birth of a daughter#1 | Maria Alexandra FIERRO about 1745 (Age 45 years) Note: According to census of 1777 in Valle de Allende, age 32, soltera, daughter of Lázaro.
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| Birth of a son #2 | Diego FIERRO about 1747 (Age 47 years) |
 Residence | 1753 (Age 53 years) Note: Family livd within walls of San Francisco de Conchos Presidio
Lázaro de Fierro Lived Within Presidio of Conchos Note: More than likely Lázaro de Fierro was a soldier in the Presidio at the time of its closing in 1752, He was listed as living within the presidio with his family of 3 in the padrón de vecinos in 1753. Living next door were Juan de Fierro and Miguel de Fierro families. Also in the presidio was the family of Francisco Fierro. No doubt some of these families were closed related, probably brothers, fathers or cousins.
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| Birth of a son #3 | Basilio Cristobal FIERRO about 1754 (Age 54 years) |
| Birth of a son #4 | Jose Domingo FIERRO about 1756 (Age 56 years) |
| Birth of a son #5 | Jose Nicolas FIERRO about 1757 (Age 57 years) |
| Birth of a son #6 | Ramon FIERRO about 1763 (Age 63 years) |
| Birth of a daughter #7 | Juana FIERRO about 1764 (Age 64 years) |
| Birth of a daughter #8 | Soledad FIERRO about 1767 (Age 67 years) |
 Occupation | Cattle Breeder 1774 (Age 74 years) |
| Baptism of a daughter | Maria Alejandra Barbara FIERRO August 8, 1774 (Age 74 years) |
 Census | Rita SALSIDO — View this family 1777 (Age 77 years) Address: Rancho San Cristobal de Cienguilla Note: 1777 Census shows Lazaro was 68 and had children ranging from ages 32 to 2. Evidently he was widowed twice. His ranch was evidently called San Cristobal de Cieneguilla.
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| Death of a wife | Rita SALSIDO before 1778 (Age 78 years) Note: The marriage record of her son Nicolas in 1778 stated Rita Salcido was deceased.
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| Marriage of a child | Jose Nicolas FIERRO — Francisca Petra Geronima RONQUILLO — View this family Type: Religious marriage May 21, 1778 (Age 78 years) |
| Census | 1779 (Age 79 years) |
| Marriage of a child | Diego FIERRO — Maria Barbara MUÑOS — View this family May 8, 1780 (Age 80 years) |
 Military | Dragones Provinciales de San Carlos January 1, 1781 (Age 81 years) |
| Death of a daughter | Maria Alexandra FIERRO June 7, 1782 (Age 82 years) |
 Burial | June 18, 1790 (Age 90 years) |