Own work Own work by DeliriumMaps (Delirium333). The sources used for making the map are the following:
Sources for the base map:
1. 1819 Map of Tondo Province by Ildefonso de Aragon
2. 1885 Map of Manila by Élisée Reclus
3. 1899 Map of Manila Bay from the US Library of Congress
4. January 1902 Telegraph Map of the Philippines from the National Geographic Magazine
5. 1899 Plano de Manila Map by Holliday, Wise & Co.
6. 1898 Map of Manila by Francisco J. de Gamoneda
7. 1910 Map of Cavite Harbor
8. "How the Volcano reclaimed Pampanga from the Sea" by Joel P. Mallari and Robby Tantingco, from the Juan D. Nepomuceno Center for Kapampangan Studies, Holy Angel University

Sources for polities:
1. https://tulay.ph/2021/07/14/exploring-the-mystery-sto-cristo-de-longos/ (for locating Dongos/Longos, which was under Namayan)
2. "Estado, Topográfico, Estadistíco, Histórico—Religioso, de la Santa y Apostólica Provincia de San Gregorio Magno, de Religiosos Menores Descalzos de la Regular y Mas Estrecha Observancia De Nuestro Padre San Francisco, en las Islas Filipinas" (1865) by Fray. Felix Huerta in original Spanish (Sapa, Meycatmon, Dongos, Namayan, Meysapan, also states that Taytay, San Juan, Sampaloc, Malate, Mandaluyong, Makati, Santa Ana, San Miguel and Quiapo were under Namayan)
3. "Estado, Topográfico, Estadistíco, Histórico—Religioso, de la Santa y Apostólica Provincia de San Gregorio Magno, de Religiosos Menores Descalzos de la Regular y Mas Estrecha Observancia De Nuestro Padre San Francisco, en las Islas Filipinas" in English translated by Dominador N. Marcaida Jr.
4. "Ang Tundo ni Bonifacio, Si Bonifacio sa Tundo" (2014) by Nancy Kimuell-Gabriel (used for Maysilo, Katanghalan and Pulo as well as the boundaries of Tondo)
5. "Pasay - The Travel City” (2013) by Melandrew T. Velasco
6. https://www.makati.gov.ph/barangay/comembo/11?page=162&tab=157 (for Mamancat)
7. “Meysapan: The Formation and Social Effects of a Landed Estate in the Philippines’” (1973) by Nicholas P. Cushner (for Maysapang and Buting)
8. “Pre-colonial Manila” from the Presidential Museum and Library
9. “The Philippine Islands, 1493-1898, Volume 3” (1906) by Emma H. Blair and James Alexander Robertson (Tondo, Maynila, Cainta, Navotas, Tambobong)
10. “The Philippine Islands, 1493-1898, Volume 5” (1906) by Emma H. Blair and James Alexander Robertson (for Longalo/Dongalo and Palañac/Palanyag)
11. “The Philippine Islands, 1493-1898, Volume 34” (1906) by Emma H. Blair and James Alexander Robertson (for villages in Pasig)
12. “24th of June 1597: The Founding Date of Taytay” (2014) from the St. John the Baptist Church, Taytay, Rizal
13. “Historical Background and Development” from the Local Government of Angono
14. “History" (for the settlements annexed into Taguig by 1587)
15. “The Origin of Pinagbuhatan” (for Pasig)
16. “Barangay Santolan History” from the Pasig City Hall Library (ancient settlements around Pasig)
17. “Barangay Sixteenth Century Philippine Culture and Society” (1994) by William Henry Scott (claims of land reclamation around Baybay/San Nicolas and Maynila's territorial scope)
18. “Conquest and Pestilence in the Early Spanish Philippines” (2009) by Linda Newson
19. "A History of the Inarticulate" (2001) by Luis Camara Dery (regarding Lakantagkan being Arao, the ancestor of Lontok and Gatpandan, as well as the rulers of Tondo and Maynila. This is the reason why Tondo and Maynila are included under Namayan, and even if Lakantagkan was not Arao, it was still under a unified Pasig polity under Lontok and Kalangitan as implied in the Fernando Malang Balagtas will of 1589)
20. "The Sage of Bitukang Manok - Pasig City Hall Library" (for Bitukang Manok)
21. "Barangay Maybunga - City of Pasig" (for Maybunga)