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Elizabeth Sinclair on IGI in Moray around 1799/1800 when census 1851 William EAGLE and Family indicates she was born

The 1798 appears to fit especially as her daughter was named Isabell and she had sister of same name 

    1. ELIZABETH SINCLAIR - International Genealogical Index
Gender: Female Birth: 16 SEP 1797
    2. ELIZABETH SINCLAIR - International Genealogical Index
Gender: Female Christening: 25 SEP 1797 Elgin, Moray, Scotland
Birth: 16 SEP 1797 
Christening: 25 SEP 1797 Elgin, Moray, Scotland 
Father: ALEXANDER SINCLAIR 
Mother: ELIZABETH CUMMING 
The 1798 girl seems more likely
    3. ELIZABETH SINCLAIR - International Genealogical Index
Gender: Female Birth: 11 SEP 1798
    4. ELIZABETH SINCLAIR - International Genealogical Index
Gender: Female Christening: 23 SEP 1798 Elgin, Moray, Scotland
ELIZABETH SINCLAIR 
Birth: 11 SEP 1798 
Christening: 23 SEP 1798 Elgin, Moray, Scotland 
Father: THOMAS SINCLAIR 
Mother: MARY GILLIES 

see 1774 MARY GILLES

 

Siblings 

ISABELLA SINCLAIR 
Birth: 12 AUG 1799 
Christening: 12 SEP 1799 Elgin, Moray, Scotland 
Father: THOMAS SINCLAIR 
Mother: MARY GILLIES 

and

NIEL SINCLAIR 
Birth: 24 MAR 1801 
Christening: 28 MAR 1801 Elgin, Moray, Scotland 
Father: THOMAS SINCLAIR 
Mother: MARY GILLIES 

no first name SINCLAIR (Male) 
Birth: 28 NOV 1802 
Christening: 07 DEC 1802 Elgin, Moray, Scotland 
Father: THOMAS SINCLAIR 
Mother: MARY GILLIES 

    5. ELISABETH SINCLAIR - International Genealogical Index
Gender: Female Birth: 26 JUN 1804
Dyke is well west of Elgin
    6. ELISABETH SINCLAIR - International Genealogical Index
Gender: Female Christening: 02 JUL 1804 Dyke, Moray, Scotland